Release 1.5.0

- Remove non-functional markPrivate feature and Objective-C runtime hacks
- Extract mirror engine into MirrorEngine.swift
- Move calLabel to MirrorUtils.swift
- Update AGENTS.md architecture documentation
- Bump version to 1.5.0 (build 19)

.gitignore

@@ -18,5 +18,7 @@ ExportOptions.plist
 
 # Misc
 *.swp
+*.profraw
 *.zip
 *.sha256
+dist/

AGENTS.md

@@ -0,0 +1,157 @@
+# BusyMirror — Agent Reference
+
+> This file is written for AI coding agents. It assumes you know nothing about the project.
+
+## Project Overview
+
+**BusyMirror** is a macOS menu-bar utility that mirrors calendar events from a source calendar into one or more target calendars, creating busy-placeholder events so availability stays consistent across accounts and devices.
+
+It is a single-platform macOS app written in **Swift 5** and **SwiftUI**, using **EventKit** to read and write calendar data. The app runs as a menu-bar-only app (`LSUIElement`) with no Dock icon.
+
+Key capabilities:
+- Manual or route-driven multi-source mirroring
+- Privacy mode: hide details (placeholder title)
+- DRY-RUN mode to preview changes without writing
+- Scheduled headless runs via a self-installed `launchd` LaunchAgent
+- Settings autosave/restore, plus Import/Export JSON
+- CLI support for headless/scripted runs
+
+## Technology Stack
+
+| Layer | Technology |
+|-------|------------|
+| Language | Swift 5.0 |
+| UI Framework | SwiftUI + AppKit (menu bar, panels) |
+| Calendar API | EventKit (`EKEventStore`, `EKEvent`, `EKCalendar`) |
+| Persistence | `UserDefaults` (JSON-encoded settings), `@AppStorage` |
+| Scheduling | `launchd` / `launchctl` (user LaunchAgent) |
+| Build System | Xcode project (`BusyMirror.xcodeproj`) + Makefile |
+| Target OS | macOS 15.5+ |
+| Signing | Ad-hoc (`CODE_SIGN_IDENTITY = "-"`) — not notarized |
+
+No external Swift Package Manager dependencies are used. The project is self-contained.
+
+## Project Structure
+
+```
+BusyMirror/
+├── BusyMirrorApp.swift          # App entry point; defines Window + MenuBarExtra
+├── ContentView.swift            # Main UI, settings, CLI, scheduling (≈1800 lines)
+├── MirrorEngine.swift           # EventKit mirror engine (read, deduplicate, merge, create/update/delete)
+├── MirrorConfig.swift           # Configuration struct passed to the engine
+├── MirrorUtils.swift            # URL builders, mirror detection, calendar labels
+├── BlockMath.swift              # Block merging, gap calculation, overlap logic
+├── EventFilters.swift           # Work-hours, title, and organizer filters
+├── MenuBarSupport.swift         # `BusyMirrorAppController` (state coordinator) + menu bar view
+├── Info.plist                   # LSUIElement, calendar usage descriptions
+├── BusyMirror.entitlements      # App sandbox + calendar access entitlement
+└── Assets.xcassets/             # AppIcon set and accent color
+
+BusyMirror.xcodeproj/            # Xcode project
+BusyMirrorTests/                 # Empty (no tests implemented)
+BusyMirrorUITests/               # Empty (no tests implemented)
+```
+
+**Architecture note:** `ContentView.swift` handles the SwiftUI view hierarchy, settings serialization, CLI argument parsing, `launchd` scheduling, and logging. The EventKit mirror engine lives in `MirrorEngine.swift` and is invoked from `ContentView` via `makeEngine()`. Pure helper logic (block math, filters, URL utilities) has been extracted into standalone files for testability.
+
+When making changes, keep the existing data flow (`@EnvironmentObject`, `@AppStorage`, `@State`) intact in `ContentView.swift`.
+
+## Build and Release Commands
+
+### Makefile targets
+
+```bash
+make build-debug      # Debug build via xcodebuild
+make build-release    # Release build via xcodebuild
+make sign-app         # Ad-hoc sign the Release app (strip xattr, codesign)
+make app              # Verify signed app exists
+make package          # Create BusyMirror-<version>-macOS.zip + .sha256
+make clean            # Clean derived data
+```
+
+Built products:
+- Unsigned release: `build/DerivedData/Build/Products/Release/BusyMirror.app`
+- Signed release: `build/ReleaseSigned/BusyMirror.app`
+
+### Xcode
+
+1. Open `BusyMirror.xcodeproj`.
+2. Select **BusyMirror** scheme → **My Mac**.
+3. **Product → Build** (or **Archive** for distribution).
+
+### Versioning
+
+- `MARKETING_VERSION` and `CURRENT_PROJECT_VERSION` live in `project.pbxproj`.
+- The Makefile extracts `MARKETING_VERSION` automatically for ZIP naming.
+- Update both Debug and Release build configurations when bumping the version.
+
+## Code Style Guidelines
+
+- **Language:** all code, comments, and user-facing strings are in **English**.
+- **Concurrency:** `@MainActor` is required on methods that mutate SwiftUI `@State` or call EventKit on the main thread. The compiler enforces strict concurrency.
+- **Formatting:** standard Swift style (4-space indentation). No external linter is configured.
+- **Logging:** use the `log(_:)` method inside `ContentView`; it appends to both the on-screen log editor and the persistent file log (`~/Library/Logs/BusyMirror/BusyMirror.log`).
+- **Error handling:** EventKit errors are caught and logged; they must never crash the app. The file logger swallows its own errors silently.
+
+## Testing
+
+- Unit tests exist in `BusyMirrorTests/` for `BlockMath`, `EventFilters`, and `MirrorUtils`.
+- When adding logic, prefer extracting pure functions (e.g., block merging, gap calculation, filter logic) so they can be unit-tested.
+- Manual testing checklist for releases:
+  1. Grant Calendar permission.
+  2. Select a source and target, run DRY-RUN, verify log output.
+  3. Toggle WRITE and run Mirror Now; verify placeholders appear in the target calendar.
+  4. Move a source event and re-run; verify the placeholder updates.
+  5. Test Cleanup Placeholders (dry-run and write).
+  6. Add a route, install a schedule, verify the LaunchAgent plist is created in `~/Library/LaunchAgents/`.
+  7. Trigger a menu-bar sync and confirm the window opens if not visible.
+
+## Security and Privacy Considerations
+
+- **Calendar data:** the app reads and writes the user’s calendars via EventKit. It must handle permission denial gracefully.
+- **Sandbox:** the app uses the macOS app sandbox (`com.apple.security.app-sandbox`) and the `com.apple.security.personal-information.calendars` entitlement.
+- **Signing:** releases are ad-hoc signed only (`codesign --sign -`). They are **not notarized**. Gatekeeper may block the app on first launch; users may need to right-click → Open.
+- **Loop guard:** a `sessionGuard` set prevents mirroring an event into the same target twice in one run, and prefix-based detection (`titlePrefix`) prevents re-mirroring already-mirrored placeholders.
+- **Logging:** log files are written to the user’s `~/Library/Logs/BusyMirror/`. No log data is transmitted externally.
+
+## CLI and Scheduling
+
+The binary supports headless execution:
+
+```bash
+# Run saved routes (used by the LaunchAgent)
+BusyMirror.app/Contents/MacOS/BusyMirror --run-saved-routes --write 1 --exit
+
+# Manual route via 1-based UI indices
+BusyMirror.app/Contents/MacOS/BusyMirror --routes "1->2,3" --write 1 --exit
+```
+
+Relevant flags: `--privacy`, `--copy-notes`, `--all-day`, `--days-forward`, `--days-back`, `--merge-gap-hours`, `--mode`, `--exclude-titles`, `--exclude-organizers`, `--cleanup-only`, `--exit`.
+
+Scheduled runs are implemented by generating a `launchd` plist in `~/Library/LaunchAgents/com.cqrenet.BusyMirror.saved-routes.plist` and bootstrapping it with `launchctl`. The app removes and re-bootstraps the agent on every "Install Schedule" click.
+
+## Key Files to Know
+
+| File | Purpose |
+|------|---------|
+| `BusyMirror/ContentView.swift` | UI, settings, CLI, scheduling |
+| `BusyMirror/MirrorEngine.swift` | EventKit mirror engine (runMirror, runCleanup, index persistence) |
+| `BusyMirror/MirrorConfig.swift` | Configuration struct for mirror runs |
+| `BusyMirror/MirrorUtils.swift` | Mirror URL builders, event detection, calendar labels |
+| `BusyMirror/BlockMath.swift` | Block merging, gap calculation, overlap logic |
+| `BusyMirror/EventFilters.swift` | Work-hours, title, and organizer filters |
+| `BusyMirror/BusyMirrorApp.swift` | App struct, window scene, menu-bar extra |
+| `BusyMirror/MenuBarSupport.swift` | `@MainActor` app controller + menu bar SwiftUI view |
+| `BusyMirror/Info.plist` | `LSUIElement`, calendar usage descriptions |
+| `BusyMirror/BusyMirror.entitlements` | Sandbox + calendar entitlement |
+| `Makefile` | Reproducible build, sign, and package targets |
+| `CHANGELOG.md` | Release notes (human-readable) |
+| `ROADMAP.md` | Planned features |
+
+## Notes for Agents
+
+- Do **not** add third-party dependencies unless the user explicitly asks. The project intentionally has zero external packages.
+- If you refactor `ContentView.swift`, preserve `@AppStorage` keys and `UserDefaults` keys exactly; users have existing settings on disk.
+- The mirror engine (`MirrorEngine.swift`) is `@MainActor` and accepts an `EKEventStore` plus a logging closure. It does not directly mutate SwiftUI `@State`; `ContentView` manages all view state.
+- When modifying build settings, update both Debug and Release configurations in `project.pbxproj`, and update `CHANGELOG.md` if the change is user-visible.
+- Do not run `git commit`, `git push`, or similar operations unless explicitly asked.

BusyMirror.xcodeproj/project.pbxproj

@@ -410,7 +410,7 @@
 				"CODE_SIGN_IDENTITY[sdk=macosx*]" = "-";
 				CODE_SIGN_STYLE = Automatic;
 				COMBINE_HIDPI_IMAGES = YES;
-				CURRENT_PROJECT_VERSION = 4;
+				CURRENT_PROJECT_VERSION = 19;
 				ENABLE_PREVIEWS = YES;
 				GENERATE_INFOPLIST_FILE = YES;
 				INFOPLIST_FILE = BusyMirror/Info.plist;
@@ -421,7 +421,7 @@
 					"$(inherited)",
 					"@executable_path/../Frameworks",
 				);
-				MARKETING_VERSION = 1.2.1;
+                MARKETING_VERSION = 1.5.0;
 				PRODUCT_BUNDLE_IDENTIFIER = com.cqrenet.BusyMirror;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				REGISTER_APP_GROUPS = YES;
@@ -440,7 +440,7 @@
 				"CODE_SIGN_IDENTITY[sdk=macosx*]" = "-";
 				CODE_SIGN_STYLE = Automatic;
 				COMBINE_HIDPI_IMAGES = YES;
-				CURRENT_PROJECT_VERSION = 4;
+				CURRENT_PROJECT_VERSION = 19;
 				ENABLE_PREVIEWS = YES;
 				GENERATE_INFOPLIST_FILE = YES;
 				INFOPLIST_FILE = BusyMirror/Info.plist;
@@ -451,7 +451,7 @@
 					"$(inherited)",
 					"@executable_path/../Frameworks",
 				);
-				MARKETING_VERSION = 1.2.1;
+                MARKETING_VERSION = 1.5.0;
 				PRODUCT_BUNDLE_IDENTIFIER = com.cqrenet.BusyMirror;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				REGISTER_APP_GROUPS = YES;

BusyMirror/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -1,55 +1,15 @@
 {
   "images" : [
-    {
-      "idiom" : "mac",
-      "scale" : "1x",
-      "size" : "16x16"
-    },
-    {
-      "idiom" : "mac",
-      "scale" : "2x",
-      "size" : "16x16"
-    },
-    {
-      "idiom" : "mac",
-      "scale" : "1x",
-      "size" : "32x32"
-    },
-    {
-      "idiom" : "mac",
-      "scale" : "2x",
-      "size" : "32x32"
-    },
-    {
-      "idiom" : "mac",
-      "scale" : "1x",
-      "size" : "128x128"
-    },
-    {
-      "idiom" : "mac",
-      "scale" : "2x",
-      "size" : "128x128"
-    },
-    {
-      "idiom" : "mac",
-      "scale" : "1x",
-      "size" : "256x256"
-    },
-    {
-      "idiom" : "mac",
-      "scale" : "2x",
-      "size" : "256x256"
-    },
-    {
-      "idiom" : "mac",
-      "scale" : "1x",
-      "size" : "512x512"
-    },
-    {
-      "idiom" : "mac",
-      "scale" : "2x",
-      "size" : "512x512"
-    }
+    { "filename" : "icon_16x16.png", "idiom" : "mac", "scale" : "1x", "size" : "16x16" },
+    { "filename" : "icon_32x32.png", "idiom" : "mac", "scale" : "2x", "size" : "16x16" },
+    { "filename" : "icon_32x32.png", "idiom" : "mac", "scale" : "1x", "size" : "32x32" },
+    { "filename" : "icon_64x64.png", "idiom" : "mac", "scale" : "2x", "size" : "32x32" },
+    { "filename" : "icon_128x128.png", "idiom" : "mac", "scale" : "1x", "size" : "128x128" },
+    { "filename" : "icon_256x256.png", "idiom" : "mac", "scale" : "2x", "size" : "128x128" },
+    { "filename" : "icon_256x256.png", "idiom" : "mac", "scale" : "1x", "size" : "256x256" },
+    { "filename" : "icon_512x512.png", "idiom" : "mac", "scale" : "2x", "size" : "256x256" },
+    { "filename" : "icon_512x512.png", "idiom" : "mac", "scale" : "1x", "size" : "512x512" },
+    { "filename" : "icon_1024x1024.png", "idiom" : "mac", "scale" : "2x", "size" : "512x512" }
   ],
   "info" : {
     "author" : "xcode",

BusyMirror/BlockMath.swift

@@ -0,0 +1,75 @@
+import Foundation
+
+struct Block: Hashable {
+    let start: Date
+    let end: Date
+    let srcStableID: String?  // stable source item ID for reschedule tracking
+    let label: String?        // source title (for dry-run / non-private)
+    let notes: String?        // source notes (for optional copy)
+    let occurrence: Date?     // occurrenceDate for recurring instances
+}
+
+// De-dup blocks by occurrence (preferred) or by time range
+func uniqueBlocks(_ blocks: [Block], trackByID: Bool) -> [Block] {
+    var seen = Set<String>()
+    var out: [Block] = []
+    for b in blocks {
+        let key: String
+        if trackByID, let sid = b.srcStableID {
+            let occ = b.occurrence.map { String($0.timeIntervalSince1970) } ?? "-"
+            key = "id|\(sid)|\(occ)"
+        } else {
+            key = "t|\(b.start.timeIntervalSince1970)|\(b.end.timeIntervalSince1970)"
+        }
+        if seen.insert(key).inserted { out.append(b) }
+    }
+    return out
+}
+
+func mergeBlocks(_ blocks: [Block], gapMinutes: Int) -> [Block] {
+    guard !blocks.isEmpty else { return [] }
+    let sorted = blocks.sorted { $0.start < $1.start }
+    var out: [Block] = []
+    var cur = Block(start: sorted[0].start, end: sorted[0].end, srcStableID: nil, label: nil, notes: nil, occurrence: nil)
+    for b in sorted.dropFirst() {
+        let gap = b.start.timeIntervalSince(cur.end) / 60.0
+        if gap <= Double(gapMinutes) {
+            if b.end > cur.end { cur = Block(start: cur.start, end: b.end, srcStableID: nil, label: nil, notes: nil, occurrence: nil) }
+        } else {
+            out.append(cur)
+            cur = Block(start: b.start, end: b.end, srcStableID: nil, label: nil, notes: nil, occurrence: nil)
+        }
+    }
+    out.append(cur)
+    return out
+}
+
+func coalesce(_ segs: [Block]) -> [Block] { mergeBlocks(segs, gapMinutes: 0) }
+
+func fullyCovered(_ mergedSegs: [Block], block: Block, tolMin: Double) -> Bool {
+    for s in mergedSegs {
+        if s.start <= block.start.addingTimeInterval(tolMin * 60),
+           s.end >= block.end.addingTimeInterval(-tolMin * 60) { return true }
+    }
+    return false
+}
+
+func gapsWithin(_ mergedSegs: [Block], in block: Block) -> [Block] {
+    if mergedSegs.isEmpty { return [Block(start: block.start, end: block.end, srcStableID: nil, label: nil, notes: nil, occurrence: nil)] }
+    var segs: [Block] = []
+    for s in mergedSegs where s.end > block.start && s.start < block.end {
+        let ss = max(s.start, block.start)
+        let ee = min(s.end, block.end)
+        if ee > ss { segs.append(Block(start: ss, end: ee, srcStableID: nil, label: nil, notes: nil, occurrence: nil)) }
+    }
+    if segs.isEmpty { return [Block(start: block.start, end: block.end, srcStableID: nil, label: nil, notes: nil, occurrence: nil)] }
+    let merged = coalesce(segs)
+    var gaps: [Block] = []
+    var prevEnd = block.start
+    for s in merged {
+        if s.start > prevEnd { gaps.append(Block(start: prevEnd, end: s.start, srcStableID: nil, label: nil, notes: nil, occurrence: nil)) }
+        if s.end > prevEnd { prevEnd = s.end }
+    }
+    if prevEnd < block.end { gaps.append(Block(start: prevEnd, end: block.end, srcStableID: nil, label: nil, notes: nil, occurrence: nil)) }
+    return gaps
+}

BusyMirror/BusyMirror.entitlements

@@ -8,5 +8,9 @@
 	<true/>
 	<key>com.apple.security.personal-information.calendars</key>
 	<true/>
+	<key>com.apple.security.temporary-exception.files.home-relative-path.read-write</key>
+	<array>
+		<string>Library/LaunchAgents/</string>
+	</array>
 </dict>
 </plist>

BusyMirror/BusyMirrorApp.swift

@@ -2,10 +2,19 @@ import SwiftUI
 
 @main
 struct BusyMirrorApp: App {
+    @StateObject private var appController = BusyMirrorAppController()
+
     var body: some Scene {
-        WindowGroup {
+        Window("BusyMirror", id: BusyMirrorSceneID.mainWindow) {
             ContentView()
+                .environmentObject(appController)
                 .frame(minWidth: 720, minHeight: 520)
         }
+        .defaultSize(width: 1120, height: 760)
+
+        MenuBarExtra("BusyMirror", systemImage: appController.isSyncing ? "arrow.triangle.2.circlepath.circle.fill" : "calendar.badge.clock") {
+            BusyMirrorMenuBarView()
+                .environmentObject(appController)
+        }
     }
 }

BusyMirror/EventFilters.swift

@@ -0,0 +1,60 @@
+import Foundation
+import EventKit
+
+func isOutsideWorkHours(_ startDate: Date, calendar: Calendar, startMinutes: Int, endMinutes: Int) -> Bool {
+    guard endMinutes > startMinutes else { return false }
+    let comps = calendar.dateComponents([.hour, .minute], from: startDate)
+    guard let hour = comps.hour else { return false }
+    let minute = comps.minute ?? 0
+    let start = hour * 60 + minute
+    return start < startMinutes || start >= endMinutes
+}
+
+func shouldSkip(title: String?, filters: [String], titlePrefix: String) -> Bool {
+    guard !filters.isEmpty else { return false }
+    let rawTitle = (title ?? "").lowercased()
+    let strippedTitle = stripPrefix(title, prefix: titlePrefix).lowercased()
+    return filters.contains { token in
+        rawTitle.contains(token) || strippedTitle.contains(token)
+    }
+}
+
+func organizerEmail(_ participant: EKParticipant?) -> String? {
+    guard let url = participant?.url else { return nil }
+    if url.scheme?.lowercased() == "mailto" {
+        let abs = url.absoluteString
+        if abs.lowercased().hasPrefix("mailto:") {
+            return String(abs.dropFirst("mailto:".count))
+        }
+        return abs
+    }
+    return url.absoluteString
+}
+
+func organizerStrings(for event: EKEvent) -> [String] {
+    var out: [String] = []
+    if let org = event.organizer {
+        if let n = org.name, !n.isEmpty { out.append(n) }
+        if let e = organizerEmail(org), !e.isEmpty { out.append(e) }
+    }
+    // Fallback: some providers may not populate organizer; try chair attendee
+    if out.isEmpty, let attendees = event.attendees {
+        if let chair = attendees.first(where: { $0.participantRole == .chair }) {
+            if let n = chair.name, !n.isEmpty { out.append(n) }
+            if let e = organizerEmail(chair), !e.isEmpty { out.append(e) }
+        }
+    }
+    return out
+}
+
+func shouldSkipOrganizer(organizerValues: [String], filters: [String]) -> Bool {
+    guard !filters.isEmpty else { return false }
+    guard !organizerValues.isEmpty else { return false }
+    let vals = organizerValues.map { $0.lowercased() }
+    for token in filters {
+        for v in vals {
+            if v.contains(token) { return true }
+        }
+    }
+    return false
+}

BusyMirror/Info.plist

@@ -2,6 +2,10 @@
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
+	<key>LSUIElement</key>
+	<true/>
+	<key>LSMinimumSystemVersion</key>
+	<string>15.5</string>
 	<key>NSCalendarsFullAccessUsageDescription</key>
 	<string>BusyMirror needs access to your calendars to create busy placeholders.</string>
 	<key>NSRemindersFullAccessUsageDescription</key>

BusyMirror/MenuBarSupport.swift

@@ -0,0 +1,75 @@
+import SwiftUI
+import AppKit
+
+enum BusyMirrorSceneID {
+    static let mainWindow = "main-window"
+}
+
+@MainActor
+final class BusyMirrorAppController: ObservableObject {
+    @Published private(set) var isSyncing = false
+    @Published private(set) var hasPendingSyncRequest = false
+    @Published private(set) var syncRequestToken = UUID()
+    @Published private(set) var isMainWindowVisible = false
+
+    func requestSync() {
+        hasPendingSyncRequest = true
+        syncRequestToken = UUID()
+    }
+
+    func clearPendingSyncRequest() {
+        hasPendingSyncRequest = false
+    }
+
+    func setSyncing(_ syncing: Bool) {
+        isSyncing = syncing
+    }
+
+    func setMainWindowVisible(_ visible: Bool) {
+        isMainWindowVisible = visible
+    }
+
+    func openMainWindow(using openWindow: OpenWindowAction) {
+        NSApp.activate(ignoringOtherApps: true)
+        openWindow(id: BusyMirrorSceneID.mainWindow)
+    }
+}
+
+struct BusyMirrorMenuBarView: View {
+    @Environment(\.openWindow) private var openWindow
+    @EnvironmentObject private var appController: BusyMirrorAppController
+
+    var body: some View {
+        VStack(alignment: .leading, spacing: 10) {
+            Text("BusyMirror")
+                .font(.headline)
+
+            Text(appController.isSyncing ? "Sync in progress." : "Use your saved routes or current selection.")
+                .font(.subheadline)
+                .foregroundStyle(.secondary)
+
+            Divider()
+
+            Button(appController.isSyncing ? "Syncing…" : "Sync Now") {
+                let shouldOpenWindow = !appController.isMainWindowVisible
+                appController.requestSync()
+                if shouldOpenWindow {
+                    appController.openMainWindow(using: openWindow)
+                }
+            }
+            .disabled(appController.isSyncing)
+
+            Button("Open BusyMirror") {
+                appController.openMainWindow(using: openWindow)
+            }
+
+            Divider()
+
+            Button("Quit BusyMirror") {
+                NSApp.terminate(nil)
+            }
+        }
+        .padding(12)
+        .frame(width: 240, alignment: .leading)
+    }
+}

BusyMirror/MirrorConfig.swift

@@ -0,0 +1,22 @@
+import Foundation
+import EventKit
+
+struct MirrorConfig {
+    let daysBack: Int
+    let daysForward: Int
+    let mergeGapMin: Int
+    let hideDetails: Bool
+    let copyDescription: Bool
+    let mirrorAllDay: Bool
+    let overlapMode: OverlapMode
+    let titlePrefix: String
+    let placeholderTitle: String
+    let filterByWorkHours: Bool
+    let workHoursStart: Int
+    let workHoursEnd: Int
+    let excludedTitleFilterTerms: [String]
+    let excludedOrganizerFilterTerms: [String]
+    let mirrorAcceptedOnly: Bool
+    let autoDeleteMissing: Bool
+    let writeEnabled: Bool
+}

BusyMirror/MirrorEngine.swift

@@ -0,0 +1,612 @@
+import Foundation
+import EventKit
+
+private let SAME_TIME_TOL_MIN: Double = 5
+
+struct MirrorRecord: Hashable, Codable {
+    var targetCalendarID: String
+    var sourceCalendarID: String
+    var sourceStableID: String
+    var occurrenceTimestamp: TimeInterval?
+    var targetEventIdentifier: String?
+    var lastKnownStartTimestamp: TimeInterval
+    var lastKnownEndTimestamp: TimeInterval
+    var updatedAt: Date = Date()
+
+    var sourceKey: String {
+        sourceOccurrenceKey(
+            sourceCalID: sourceCalendarID,
+            sourceStableID: sourceStableID,
+            occurrence: occurrenceTimestamp.map { Date(timeIntervalSince1970: $0) }
+        )
+    }
+
+    var timeKey: String {
+        "\(lastKnownStartTimestamp)|\(lastKnownEndTimestamp)"
+    }
+}
+
+@MainActor
+final class MirrorEngine {
+    private let log: (String) -> Void
+    private let mirrorIndexDefaultsKey = "mirror-index.v1"
+
+    init(log: @escaping (String) -> Void) {
+        self.log = log
+    }
+
+    private func loadMirrorIndex() -> [String: MirrorRecord] {
+        guard let data = UserDefaults.standard.data(forKey: mirrorIndexDefaultsKey) else { return [:] }
+        do {
+            return try JSONDecoder().decode([String: MirrorRecord].self, from: data)
+        } catch {
+            log("✗ Failed to load mirror index: \(error.localizedDescription)")
+            return [:]
+        }
+    }
+
+    private func saveMirrorIndex(_ index: [String: MirrorRecord]) {
+        do {
+            let data = try JSONEncoder().encode(index)
+            UserDefaults.standard.set(data, forKey: mirrorIndexDefaultsKey)
+        } catch {
+            log("✗ Failed to save mirror index: \(error.localizedDescription)")
+        }
+    }
+
+    func runMirror(
+        store: EKEventStore,
+        config: MirrorConfig,
+        sourceCalendar: EKCalendar,
+        targetCalendars: [EKCalendar],
+        sessionGuard: inout Set<String>,
+        isMultiRouteRun: Bool
+    ) async {
+        let srcCal = sourceCalendar
+        let srcName = calLabel(srcCal)
+        let targets = targetCalendars.filter { $0.calendarIdentifier != srcCal.calendarIdentifier }
+        if targets.isEmpty {
+            log("No target calendars selected. Choose at least one target or add a route with valid targets.")
+            return
+        }
+
+        let cal = Calendar.current
+        let todayStart = cal.startOfDay(for: Date())
+        let windowStart = cal.date(byAdding: .day, value: -config.daysBack, to: todayStart)!
+        let windowEnd = cal.date(byAdding: .day, value: config.daysForward, to: todayStart)!
+        log("=== BusyMirror ===")
+        log("Source: \(srcName)  Targets: \(targets.map { calLabel($0) }.joined(separator: ", "))")
+        log("Window: \(windowStart) -> \(windowEnd)")
+        log("WRITE: \(config.writeEnabled) \(config.writeEnabled ? "" : "(DRY-RUN)")  mode: \(config.overlapMode.rawValue)  mergeGapMin: \(config.mergeGapMin)  allDay: \(config.mirrorAllDay)")
+        log("Route: \(srcName) → {\(targets.map { calLabel($0) }.joined(separator: ", "))}")
+
+        // Source events (recurrences expanded by EventKit)
+        let srcPred = store.predicateForEvents(withStart: windowStart, end: windowEnd, calendars: [srcCal])
+        var srcEvents = store.events(matching: srcPred)
+        let srcFetched = srcEvents.count
+        srcEvents = srcEvents.filter { $0.calendar.calendarIdentifier == srcCal.calendarIdentifier }
+        let srcKept = srcEvents.count
+        if srcKept != srcFetched {
+            log("- WARN: filtered \(srcFetched - srcKept) stray source event(s) not in \(srcName)")
+        }
+        srcEvents.sort { ($0.startDate ?? .distantPast) < ($1.startDate ?? .distantPast) }
+
+        var srcBlocks: [Block] = []
+        var skippedMirrors = 0
+        let titleFilters = config.excludedTitleFilterTerms
+        let organizerFilters = config.excludedOrganizerFilterTerms
+        let enforceWorkHours = config.filterByWorkHours && config.workHoursEnd > config.workHoursStart
+        let allowedStartMinutes = config.workHoursStart * 60
+        let allowedEndMinutes = config.workHoursEnd * 60
+        var skippedWorkHours = 0
+        var skippedTitles = 0
+        var skippedOrganizers = 0
+        var skippedStatus = 0
+        for ev in srcEvents {
+            if Task.isCancelled { break }
+            if config.mirrorAcceptedOnly, ev.hasAttendees {
+                let attendees = ev.attendees ?? []
+                if let me = attendees.first(where: { $0.isCurrentUser }) {
+                    if me.participantStatus != .accepted {
+                        skippedStatus += 1
+                        continue
+                    }
+                } else {
+                    skippedStatus += 1
+                    continue
+                }
+            }
+            if enforceWorkHours, !ev.isAllDay, let start = ev.startDate,
+               isOutsideWorkHours(start, calendar: cal, startMinutes: allowedStartMinutes, endMinutes: allowedEndMinutes) {
+                skippedWorkHours += 1
+                continue
+            }
+            if shouldSkip(title: ev.title, filters: titleFilters, titlePrefix: config.titlePrefix) {
+                skippedTitles += 1
+                continue
+            }
+            if shouldSkipOrganizer(organizerValues: organizerStrings(for: ev), filters: organizerFilters) {
+                skippedOrganizers += 1
+                continue
+            }
+            if !config.mirrorAllDay && ev.isAllDay { continue }
+            if isMirrorEvent(ev, prefix: config.titlePrefix, placeholder: config.placeholderTitle) {
+                skippedMirrors += 1
+                continue
+            }
+            guard let s = ev.startDate, let e = ev.endDate, e > s else { continue }
+            guard ev.calendar.calendarIdentifier == srcCal.calendarIdentifier else { continue }
+            let srcID = stableSourceIdentifier(for: ev)
+            srcBlocks.append(Block(start: s, end: e, srcStableID: srcID, label: ev.title, notes: ev.notes, occurrence: ev.occurrenceDate))
+        }
+        if skippedMirrors > 0 {
+            log("- SKIP mirrored-on-source: \(skippedMirrors) instance(s)")
+        }
+        if skippedWorkHours > 0 {
+            log("- SKIP outside work hours: \(skippedWorkHours) event(s)")
+        }
+        if skippedTitles > 0 {
+            log("- SKIP title filter: \(skippedTitles) event(s)")
+        }
+        if skippedOrganizers > 0 {
+            log("- SKIP organizer filter: \(skippedOrganizers) event(s)")
+        }
+        if skippedStatus > 0 {
+            log("- SKIP non-accepted status: \(skippedStatus) event(s)")
+        }
+        srcBlocks = uniqueBlocks(srcBlocks, trackByID: config.mergeGapMin == 0)
+
+        let baseBlocks = (config.mergeGapMin > 0) ? mergeBlocks(srcBlocks, gapMinutes: config.mergeGapMin) : srcBlocks
+        let trackByID = (config.mergeGapMin == 0)
+        var mirrorIndex = loadMirrorIndex()
+        var mirrorIndexChanged = false
+
+        func sourceKey(for blk: Block) -> String? {
+            guard trackByID, let sid = blk.srcStableID else { return nil }
+            return sourceOccurrenceKey(sourceCalID: srcCal.calendarIdentifier, sourceStableID: sid, occurrence: blk.occurrence)
+        }
+
+        // Cache target events across routes when possible
+        var targetEventCache: [String: [EKEvent]] = [:]
+        for tgt in targets {
+            if Task.isCancelled { break }
+            let tgtName = calLabel(tgt)
+            log(">>> Target: \(tgtName)")
+            if tgt.calendarIdentifier == srcCal.calendarIdentifier {
+                log("- SKIP target is same as source: \(tgtName)")
+                continue
+            }
+            let tgtEvents: [EKEvent]
+            if let cached = targetEventCache[tgt.calendarIdentifier] {
+                tgtEvents = cached
+            } else {
+                let tgtPred = store.predicateForEvents(withStart: windowStart, end: windowEnd, calendars: [tgt])
+                var evs = store.events(matching: tgtPred)
+                let tgtFetched = evs.count
+                evs = evs.filter { $0.calendar.calendarIdentifier == tgt.calendarIdentifier }
+                if tgtFetched != evs.count {
+                    log("- WARN: filtered \(tgtFetched - evs.count) stray target event(s) not in \(tgtName)")
+                }
+                targetEventCache[tgt.calendarIdentifier] = evs
+                tgtEvents = evs
+            }
+
+            var placeholderSet = Set<String>()
+            var occupied: [Block] = []
+            var placeholdersBySourceKey: [String: EKEvent] = [:]
+            var placeholdersByTime: [String: EKEvent] = [:]
+            var targetEventsByIdentifier: [String: EKEvent] = [:]
+            for tv in tgtEvents {
+                guard tv.calendar.calendarIdentifier == tgt.calendarIdentifier else { continue }
+                if let eid = tv.eventIdentifier {
+                    targetEventsByIdentifier[eid] = tv
+                }
+                if let ts = tv.startDate, let te = tv.endDate {
+                    let timeKey = mirrorTimeKey(start: ts, end: te)
+                    if isMirrorEvent(tv, prefix: config.titlePrefix, placeholder: config.placeholderTitle) {
+                        placeholderSet.insert(timeKey)
+                        placeholdersByTime[timeKey] = tv
+                        let parsed = parseMirrorURL(tv.url)
+                        if let sourceCalID = parsed.sourceCalID,
+                           let sourceStableID = parsed.sourceStableID,
+                           !sourceCalID.isEmpty,
+                           !sourceStableID.isEmpty {
+                            let key = sourceOccurrenceKey(sourceCalID: sourceCalID, sourceStableID: sourceStableID, occurrence: parsed.occ)
+                            placeholdersBySourceKey[key] = tv
+                            let recordKey = mirrorRecordKey(targetCalID: tgt.calendarIdentifier, sourceKey: key)
+                            let record = MirrorRecord(
+                                targetCalendarID: tgt.calendarIdentifier,
+                                sourceCalendarID: sourceCalID,
+                                sourceStableID: sourceStableID,
+                                occurrenceTimestamp: parsed.occ?.timeIntervalSince1970,
+                                targetEventIdentifier: tv.eventIdentifier,
+                                lastKnownStartTimestamp: ts.timeIntervalSince1970,
+                                lastKnownEndTimestamp: te.timeIntervalSince1970
+                            )
+                            if mirrorIndex[recordKey] != record {
+                                mirrorIndex[recordKey] = record
+                                mirrorIndexChanged = true
+                            }
+                        }
+                    }
+                    occupied.append(Block(start: ts, end: te, srcStableID: nil, label: nil, notes: nil, occurrence: nil))
+                }
+            }
+            occupied = coalesce(occupied)
+
+            var created = 0
+            var skipped = 0
+            var updated = 0
+
+            func guardKey(for blk: Block, targetID: String) -> String {
+                if let key = sourceKey(for: blk) {
+                    return "\(key)|\(targetID)"
+                }
+                return "\(srcCal.calendarIdentifier)|\(blk.start.timeIntervalSince1970)|\(blk.end.timeIntervalSince1970)|\(targetID)"
+            }
+
+            func desiredNotes(for blk: Block) -> String? {
+                (!config.hideDetails && config.copyDescription) ? blk.notes : nil
+            }
+
+            func upsertMirrorRecord(for blk: Block, event: EKEvent) {
+                guard let sid = blk.srcStableID,
+                      let key = sourceKey(for: blk),
+                      let startDate = event.startDate,
+                      let endDate = event.endDate else { return }
+                let recordKey = mirrorRecordKey(targetCalID: tgt.calendarIdentifier, sourceKey: key)
+                let record = MirrorRecord(
+                    targetCalendarID: tgt.calendarIdentifier,
+                    sourceCalendarID: srcCal.calendarIdentifier,
+                    sourceStableID: sid,
+                    occurrenceTimestamp: blk.occurrence?.timeIntervalSince1970,
+                    targetEventIdentifier: event.eventIdentifier,
+                    lastKnownStartTimestamp: startDate.timeIntervalSince1970,
+                    lastKnownEndTimestamp: endDate.timeIntervalSince1970
+                )
+                if mirrorIndex[recordKey] != record {
+                    mirrorIndex[recordKey] = record
+                    mirrorIndexChanged = true
+                }
+            }
+
+            func removeMirrorRecord(for key: String) {
+                let recordKey = mirrorRecordKey(targetCalID: tgt.calendarIdentifier, sourceKey: key)
+                if mirrorIndex.removeValue(forKey: recordKey) != nil {
+                    mirrorIndexChanged = true
+                }
+            }
+
+            func resolveMappedEvent(for record: MirrorRecord) -> EKEvent? {
+                if let eid = record.targetEventIdentifier,
+                   let event = targetEventsByIdentifier[eid],
+                   event.calendar.calendarIdentifier == tgt.calendarIdentifier {
+                    return event
+                }
+                return placeholdersByTime[record.timeKey]
+            }
+
+            func rememberMirrorEvent(_ event: EKEvent, for blk: Block) {
+                if let startDate = event.startDate, let endDate = event.endDate {
+                    let timeKey = mirrorTimeKey(start: startDate, end: endDate)
+                    placeholderSet.insert(timeKey)
+                    placeholdersByTime[timeKey] = event
+                }
+                if let key = sourceKey(for: blk) {
+                    placeholdersBySourceKey[key] = event
+                }
+                if let eid = event.eventIdentifier {
+                    targetEventsByIdentifier[eid] = event
+                }
+                upsertMirrorRecord(for: blk, event: event)
+            }
+
+            func needsUpdate(existing: EKEvent, blk: Block, displayTitle: String, desiredNotes: String?, desiredURL: URL?) -> Bool {
+                let curS = existing.startDate ?? blk.start
+                let curE = existing.endDate ?? blk.end
+                if abs(curS.timeIntervalSince(blk.start)) > SAME_TIME_TOL_MIN * 60 { return true }
+                if abs(curE.timeIntervalSince(blk.end)) > SAME_TIME_TOL_MIN * 60 { return true }
+                if (existing.title ?? "") != displayTitle { return true }
+                if (existing.notes ?? "") != (desiredNotes ?? "") { return true }
+                if existing.isAllDay { return true }
+                if (existing.url?.absoluteString ?? "") != (desiredURL?.absoluteString ?? "") { return true }
+                return false
+            }
+
+            func createOrUpdateIfNeeded(_ blk: Block) async {
+                let gKey = guardKey(for: blk, targetID: tgt.calendarIdentifier)
+                if sessionGuard.contains(gKey) {
+                    skipped += 1
+                    log("- SKIP loop-guard [\(srcName) -> \(tgtName)] \(blk.start) -> \(blk.end)")
+                    return
+                }
+
+                let baseSourceTitle = stripPrefix(blk.label, prefix: config.titlePrefix)
+                let effectiveTitle = config.hideDetails ? config.placeholderTitle : (baseSourceTitle.isEmpty ? config.placeholderTitle : baseSourceTitle)
+                let titleSuffix = config.hideDetails ? "" : (baseSourceTitle.isEmpty ? "" : " — \(baseSourceTitle)")
+                let displayTitle = (config.titlePrefix.isEmpty ? "" : config.titlePrefix) + effectiveTitle
+                let notes = desiredNotes(for: blk)
+                let desiredURL = buildMirrorURL(
+                    targetCalID: tgt.calendarIdentifier,
+                    sourceCalID: srcCal.calendarIdentifier,
+                    sourceStableID: blk.srcStableID,
+                    occurrence: blk.occurrence,
+                    start: blk.start,
+                    end: blk.end
+                )
+                let exactTimeKey = mirrorTimeKey(start: blk.start, end: blk.end)
+                let blkSourceKey = sourceKey(for: blk)
+
+                func updateExisting(_ existing: EKEvent, byTime: Bool) async {
+                    let curS = existing.startDate ?? blk.start
+                    let curE = existing.endDate ?? blk.end
+                    rememberMirrorEvent(existing, for: blk)
+                    if !needsUpdate(existing: existing, blk: blk, displayTitle: displayTitle, desiredNotes: notes, desiredURL: desiredURL) {
+                        sessionGuard.insert(gKey)
+                        skipped += 1
+                        return
+                    }
+                    let byTimeSuffix = byTime ? " (by time)" : ""
+                    if !config.writeEnabled {
+                        sessionGuard.insert(gKey)
+                        log("~ WOULD UPDATE [\(srcName) -> \(tgtName)]\(byTimeSuffix) \(curS) -> \(curE)  TO  \(blk.start) -> \(blk.end)\(titleSuffix) [title: \(displayTitle)]")
+                        updated += 1
+                        return
+                    }
+                    existing.title = displayTitle
+                    existing.startDate = blk.start
+                    existing.endDate = blk.end
+                    existing.isAllDay = false
+                    existing.notes = notes
+                    existing.url = desiredURL
+                    do {
+                        try await MainActor.run {
+                            try store.save(existing, span: .thisEvent, commit: true)
+                        }
+                        log("✓ UPDATED [\(srcName) -> \(tgtName)]\(byTimeSuffix) \(blk.start) -> \(blk.end)")
+                        rememberMirrorEvent(existing, for: blk)
+                        occupied = coalesce(occupied + [Block(start: blk.start, end: blk.end, srcStableID: nil, label: nil, notes: nil, occurrence: nil)])
+                        sessionGuard.insert(gKey)
+                        updated += 1
+                    } catch {
+                        log("Update failed: \(error.localizedDescription)")
+                    }
+                }
+
+                if let blkSourceKey,
+                   let record = mirrorIndex[mirrorRecordKey(targetCalID: tgt.calendarIdentifier, sourceKey: blkSourceKey)],
+                   let existing = resolveMappedEvent(for: record) {
+                    await updateExisting(existing, byTime: false)
+                    return
+                }
+
+                if let blkSourceKey, let existing = placeholdersBySourceKey[blkSourceKey] {
+                    await updateExisting(existing, byTime: false)
+                    return
+                }
+
+                if let existingByTime = placeholdersByTime[exactTimeKey] {
+                    await updateExisting(existingByTime, byTime: true)
+                    return
+                }
+
+                if placeholderSet.contains(exactTimeKey) {
+                    skipped += 1
+                    return
+                }
+                if !config.writeEnabled {
+                    sessionGuard.insert(gKey)
+                    log("+ WOULD CREATE [\(srcName) -> \(tgtName)] \(blk.start) -> \(blk.end)\(titleSuffix) [title: \(displayTitle)]")
+                    return
+                }
+                guard tgt.calendarIdentifier != srcCal.calendarIdentifier else {
+                    skipped += 1
+                    log("- SKIP invariant: target is source [\(srcName)]")
+                    return
+                }
+                let newEv = EKEvent(eventStore: store)
+                newEv.calendar = tgt
+                newEv.title = displayTitle
+                newEv.startDate = blk.start
+                newEv.endDate = blk.end
+                newEv.isAllDay = false
+                newEv.notes = notes
+                newEv.url = desiredURL
+                newEv.availability = .busy
+                do {
+                    try await MainActor.run {
+                        try store.save(newEv, span: .thisEvent, commit: true)
+                    }
+                    created += 1
+                    log("✓ CREATED [\(srcName) -> \(tgtName)] \(blk.start) -> \(blk.end)")
+                    rememberMirrorEvent(newEv, for: blk)
+                    occupied = coalesce(occupied + [Block(start: blk.start, end: blk.end, srcStableID: nil, label: nil, notes: nil, occurrence: nil)])
+                    sessionGuard.insert(gKey)
+                } catch {
+                    log("Save failed: \(error.localizedDescription)")
+                }
+            }
+
+            for b in baseBlocks {
+                if Task.isCancelled { break }
+                switch config.overlapMode {
+                case .allow:
+                    await createOrUpdateIfNeeded(b)
+                case .skipCovered:
+                    if fullyCovered(occupied, block: b, tolMin: SAME_TIME_TOL_MIN) {
+                        log("- SKIP covered [\(srcName) -> \(tgtName)] \(b.start) -> \(b.end)")
+                        skipped += 1
+                    } else {
+                        await createOrUpdateIfNeeded(b)
+                    }
+                case .fillGaps:
+                    let gaps = gapsWithin(occupied, in: b)
+                    if gaps.isEmpty {
+                        log("- SKIP no gaps [\(srcName) -> \(tgtName)] \(b.start) -> \(b.end)")
+                        skipped += 1
+                    } else {
+                        for g in gaps { await createOrUpdateIfNeeded(g) }
+                    }
+                }
+            }
+            log("[Summary → \(tgtName)] created=\(created), updated=\(updated), skipped=\(skipped)")
+            if config.autoDeleteMissing {
+                let activeSourceKeys = Set(baseBlocks.compactMap { sourceKey(for: $0) })
+                let validTimeKeys = Set(baseBlocks.map { mirrorTimeKey(start: $0.start, end: $0.end) })
+
+                var byID: [String: EKEvent] = [:]
+                for tv in placeholdersByTime.values {
+                    guard tv.calendar.calendarIdentifier == tgt.calendarIdentifier else { continue }
+                    if let eid = tv.eventIdentifier { byID[eid] = tv }
+                }
+
+                var removed = 0
+                var skippedOtherSource = 0
+                var skippedLegacyNoURL = 0
+                var handledEventIDs = Set<String>()
+
+                let staleMirrorRecords = mirrorIndex.filter {
+                    $0.value.targetCalendarID == tgt.calendarIdentifier &&
+                    $0.value.sourceCalendarID == srcCal.calendarIdentifier &&
+                    !activeSourceKeys.contains($0.value.sourceKey)
+                }
+
+                for (recordKey, record) in staleMirrorRecords {
+                    if Task.isCancelled { break }
+                    let candidate = resolveMappedEvent(for: record)
+                    if let candidate {
+                        if !config.writeEnabled {
+                            log("~ WOULD DELETE (missing source) [\(srcName) -> \(tgtName)] \(candidate.startDate ?? windowStart) -> \(candidate.endDate ?? windowEnd)")
+                        } else {
+                            do {
+                                try await MainActor.run {
+                                    try store.remove(candidate, span: .thisEvent, commit: true)
+                                }
+                                removed += 1
+                            } catch {
+                                log("Delete failed: \(error.localizedDescription)")
+                            }
+                        }
+                        if let eid = candidate.eventIdentifier {
+                            handledEventIDs.insert(eid)
+                        }
+                    }
+                    if config.writeEnabled || candidate == nil {
+                        if mirrorIndex.removeValue(forKey: recordKey) != nil {
+                            mirrorIndexChanged = true
+                        }
+                    }
+                }
+
+                for ev in byID.values {
+                    if Task.isCancelled { break }
+                    if let eid = ev.eventIdentifier, handledEventIDs.contains(eid) {
+                        continue
+                    }
+                    let parsed = parseMirrorURL(ev.url)
+                    var shouldDelete = false
+                    var parsedSourceKey: String? = nil
+                    if let sourceCalID = parsed.sourceCalID, !sourceCalID.isEmpty {
+                        if sourceCalID != srcCal.calendarIdentifier {
+                            skippedOtherSource += 1
+                            continue
+                        }
+                        if let sourceStableID = parsed.sourceStableID, !sourceStableID.isEmpty {
+                            let key = sourceOccurrenceKey(sourceCalID: sourceCalID, sourceStableID: sourceStableID, occurrence: parsed.occ)
+                            parsedSourceKey = key
+                            if !activeSourceKeys.contains(key) { shouldDelete = true }
+                        } else if trackByID,
+                                  let s = ev.startDate,
+                                  let e = ev.endDate,
+                                  !validTimeKeys.contains(mirrorTimeKey(start: s, end: e)) {
+                            shouldDelete = true
+                        }
+                    } else if trackByID && !isMultiRouteRun {
+                        if let s = ev.startDate,
+                           let e = ev.endDate,
+                           !validTimeKeys.contains(mirrorTimeKey(start: s, end: e)) {
+                            shouldDelete = true
+                        }
+                    } else if trackByID && isMultiRouteRun {
+                        let hasMapping = mirrorIndex.values.contains {
+                            $0.targetCalendarID == tgt.calendarIdentifier &&
+                            $0.sourceCalendarID == srcCal.calendarIdentifier &&
+                            $0.targetEventIdentifier == ev.eventIdentifier
+                        }
+                        if !hasMapping {
+                            skippedLegacyNoURL += 1
+                        }
+                        continue
+                    }
+                    if shouldDelete {
+                        if !config.writeEnabled {
+                            log("~ WOULD DELETE (missing source) [\(srcName) -> \(tgtName)] \(ev.startDate ?? windowStart) -> \(ev.endDate ?? windowEnd)")
+                        } else {
+                            do {
+                                try await MainActor.run {
+                                    try store.remove(ev, span: .thisEvent, commit: true)
+                                }
+                                removed += 1
+                            } catch {
+                                log("Delete failed: \(error.localizedDescription)")
+                            }
+                        }
+                        if let key = parsedSourceKey {
+                            removeMirrorRecord(for: key)
+                        }
+                    }
+                }
+                if removed > 0 { log("[Cleanup missing for \(tgtName)] deleted=\(removed)") }
+                if skippedOtherSource > 0 {
+                    log("- INFO cleanup skipped \(skippedOtherSource) placeholders from other source routes on \(tgtName)")
+                }
+                if skippedLegacyNoURL > 0 {
+                    log("- INFO cleanup skipped \(skippedLegacyNoURL) unmanaged legacy placeholders without source metadata on \(tgtName)")
+                }
+            }
+        }
+        if mirrorIndexChanged {
+            saveMirrorIndex(mirrorIndex)
+        }
+    }
+
+    func runCleanup(
+        store: EKEventStore,
+        daysBack: Int,
+        daysForward: Int,
+        sourceCalendar: EKCalendar,
+        targetCalendars: [EKCalendar],
+        titlePrefix: String,
+        placeholderTitle: String,
+        writeEnabled: Bool
+    ) async {
+        let cal = Calendar.current
+        let todayStart = cal.startOfDay(for: Date())
+        let windowStart = cal.date(byAdding: .day, value: -daysBack, to: todayStart)!
+        let windowEnd = cal.date(byAdding: .day, value: daysForward, to: todayStart)!
+        log("=== Cleanup Busy placeholders in window ===")
+        log("(Cleanup is SAFE: mirrored events detected by url prefix or title prefix ‘\(titlePrefix)’)")
+        log("Window: \(windowStart) -> \(windowEnd)")
+
+        for tgt in targetCalendars {
+            let tgtPred = store.predicateForEvents(withStart: windowStart, end: windowEnd, calendars: [tgt])
+            let tgtEvents = store.events(matching: tgtPred)
+            var delCount = 0
+            for ev in tgtEvents {
+                guard isMirrorEvent(ev, prefix: titlePrefix, placeholder: placeholderTitle) else { continue }
+                if !writeEnabled {
+                    log("~ WOULD DELETE [\(tgt.title)] \(ev.startDate ?? todayStart) -> \(ev.endDate ?? todayStart)")
+                } else {
+                    do {
+                        try await MainActor.run {
+                            try store.remove(ev, span: .thisEvent, commit: true)
+                        }
+                        delCount += 1
+                    }
+                    catch { log("Delete failed: \(error.localizedDescription)") }
+                }
+            }
+            log("[Cleanup \(tgt.title)] deleted=\(delCount)")
+        }
+    }
+}

BusyMirror/MirrorUtils.swift

@@ -0,0 +1,123 @@
+import Foundation
+import EventKit
+
+// Calendar label helper to disambiguate identical names
+func calLabel(_ cal: EKCalendar) -> String {
+    let src = cal.source.title
+    return src.isEmpty ? cal.title : "\(cal.title) — \(src)"
+}
+
+// Remove our prefix when building titles so it never doubles up
+func stripPrefix(_ title: String?, prefix: String) -> String {
+    guard let t = title else { return "" }
+    if prefix.isEmpty { return t }
+    return t.hasPrefix(prefix) ? String(t.dropFirst(prefix.count)) : t
+}
+
+private let mirrorURLAllowedCharacters = CharacterSet(charactersIn: "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-._~")
+
+func mirrorURLComponentEncode(_ raw: String) -> String {
+    raw.addingPercentEncoding(withAllowedCharacters: mirrorURLAllowedCharacters) ?? raw
+}
+
+func mirrorURLComponentDecode(_ raw: Substring) -> String {
+    let value = String(raw)
+    return value.removingPercentEncoding ?? value
+}
+
+func stableSourceIdentifier(for event: EKEvent) -> String? {
+    if let external = event.calendarItemExternalIdentifier?.trimmingCharacters(in: .whitespacesAndNewlines),
+       !external.isEmpty {
+        return "ext:\(external)"
+    }
+    let local = event.calendarItemIdentifier.trimmingCharacters(in: .whitespacesAndNewlines)
+    if !local.isEmpty {
+        return "loc:\(local)"
+    }
+    if let legacy = event.eventIdentifier?.trimmingCharacters(in: .whitespacesAndNewlines),
+       !legacy.isEmpty {
+        return "evt:\(legacy)"
+    }
+    return nil
+}
+
+func sourceOccurrenceKey(sourceCalID: String, sourceStableID: String, occurrence: Date?) -> String {
+    let occPart = occurrence.map { String($0.timeIntervalSince1970) } ?? "-"
+    return "\(sourceCalID)|\(sourceStableID)|\(occPart)"
+}
+
+func mirrorRecordKey(targetCalID: String, sourceKey: String) -> String {
+    "\(targetCalID)|\(sourceKey)"
+}
+
+func mirrorTimeKey(start: Date, end: Date) -> String {
+    "\(start.timeIntervalSince1970)|\(end.timeIntervalSince1970)"
+}
+
+func buildMirrorURL(targetCalID: String, sourceCalID: String, sourceStableID: String?, occurrence: Date?, start: Date, end: Date) -> URL? {
+    let sourceID = sourceStableID ?? ""
+    let occ = occurrence.map { String($0.timeIntervalSince1970) } ?? "-"
+    let parts = [
+        targetCalID,
+        sourceCalID,
+        sourceID,
+        occ,
+        String(start.timeIntervalSince1970),
+        String(end.timeIntervalSince1970)
+    ]
+    var components = URLComponents()
+    components.scheme = "mirror"
+    components.host = "x"
+    components.path = "/" + parts.joined(separator: ";")
+    return components.url
+}
+
+// Parse mirror URL: mirror://x/<tgtID>;<srcCalID>;<srcStableID>;<occTS>;<startTS>;<endTS>
+// Backward-compatible with legacy mirror://<tgtID>|<srcCalID>|... format
+func parseMirrorURL(_ url: URL?) -> (targetCalID: String?, sourceCalID: String?, sourceStableID: String?, occ: Date?, start: Date?, end: Date?) {
+    guard let abs = url?.absoluteString, abs.hasPrefix("mirror://") else { return (nil, nil, nil, nil, nil, nil) }
+    let body = abs.dropFirst("mirror://".count)
+    // Strip legacy host placeholder if present
+    let strippedBody = body.hasPrefix("x/") ? body.dropFirst("x/".count) : body
+    let parts = strippedBody.contains(";")
+        ? strippedBody.split(separator: ";", omittingEmptySubsequences: false)
+        : strippedBody.split(separator: "|", omittingEmptySubsequences: false)
+    var targetCalID: String? = nil
+    var sourceCalID: String? = nil
+    var srcID: String? = nil
+    var occDate: Date? = nil
+    var sDate: Date? = nil
+    var eDate: Date? = nil
+    if parts.count >= 1 { targetCalID = mirrorURLComponentDecode(parts[0]) }
+    if parts.count >= 2 { sourceCalID = mirrorURLComponentDecode(parts[1]) }
+    if parts.count >= 3 {
+        let decoded = mirrorURLComponentDecode(parts[2])
+        srcID = decoded.isEmpty ? nil : decoded
+    }
+    if parts.count >= 4,
+       String(parts[3]) != "-",
+       let ts = TimeInterval(String(parts[3])) {
+        occDate = Date(timeIntervalSince1970: ts)
+    }
+    if parts.count >= 6,
+       let sTS = TimeInterval(String(parts[4])),
+       let eTS = TimeInterval(String(parts[5])) {
+        sDate = Date(timeIntervalSince1970: sTS)
+        eDate = Date(timeIntervalSince1970: eTS)
+    }
+    return (targetCalID, sourceCalID, srcID, occDate, sDate, eDate)
+}
+
+// Pure title/URL-based mirror detection (testable without EKEvent)
+func isMirrorEvent(title: String?, urlString: String?, prefix: String, placeholder: String) -> Bool {
+    if let urlString = urlString, urlString.hasPrefix("mirror://") { return true }
+    let t = title ?? ""
+    if !prefix.isEmpty && t.hasPrefix(prefix) { return true }
+    if t == placeholder || (!prefix.isEmpty && t == (prefix + placeholder)) { return true }
+    return false
+}
+
+// EKEvent wrapper
+func isMirrorEvent(_ ev: EKEvent, prefix: String, placeholder: String) -> Bool {
+    isMirrorEvent(title: ev.title, urlString: ev.url?.absoluteString, prefix: prefix, placeholder: placeholder)
+}

BusyMirrorTests/BlockMathTests.swift

@@ -0,0 +1,158 @@
+import XCTest
+@testable import BusyMirror
+
+final class BlockMathTests: XCTestCase {
+
+    private let d = Date(timeIntervalSince1970: 0)
+
+    private func block(_ startMin: Int, _ endMin: Int, id: String? = nil) -> Block {
+        Block(
+            start: d.addingTimeInterval(TimeInterval(startMin * 60)),
+            end: d.addingTimeInterval(TimeInterval(endMin * 60)),
+            srcStableID: id,
+            label: nil,
+            notes: nil,
+            occurrence: nil
+        )
+    }
+
+    // MARK: - mergeBlocks
+
+    func testMergeBlocksNoGap() {
+        let blocks = [block(0, 10), block(10, 20)]
+        let merged = mergeBlocks(blocks, gapMinutes: 0)
+        XCTAssertEqual(merged.count, 1)
+        XCTAssertEqual(merged[0].start, blocks[0].start)
+        XCTAssertEqual(merged[0].end, blocks[1].end)
+    }
+
+    func testMergeBlocksWithGapUnderThreshold() {
+        let blocks = [block(0, 10), block(15, 20)]
+        let merged = mergeBlocks(blocks, gapMinutes: 10)
+        XCTAssertEqual(merged.count, 1)
+        XCTAssertEqual(merged[0].start, blocks[0].start)
+        XCTAssertEqual(merged[0].end, blocks[1].end)
+    }
+
+    func testMergeBlocksWithGapOverThreshold() {
+        let blocks = [block(0, 10), block(20, 30)]
+        let merged = mergeBlocks(blocks, gapMinutes: 5)
+        XCTAssertEqual(merged.count, 2)
+    }
+
+    func testMergeBlocksEmpty() {
+        XCTAssertTrue(mergeBlocks([], gapMinutes: 10).isEmpty)
+    }
+
+    func testMergeBlocksUnsortedInput() {
+        let blocks = [block(30, 40), block(0, 10), block(10, 20)]
+        let merged = mergeBlocks(blocks, gapMinutes: 0)
+        XCTAssertEqual(merged.count, 2)
+        XCTAssertEqual(merged[0].start, blocks[1].start)
+        XCTAssertEqual(merged[0].end, blocks[2].end)
+        XCTAssertEqual(merged[1].start, blocks[0].start)
+        XCTAssertEqual(merged[1].end, blocks[0].end)
+    }
+
+    // MARK: - coalesce
+
+    func testCoalesceOverlappingBlocks() {
+        let blocks = [block(0, 15), block(10, 20), block(25, 30)]
+        let result = coalesce(blocks)
+        XCTAssertEqual(result.count, 2)
+        XCTAssertEqual(result[0].start, blocks[0].start)
+        XCTAssertEqual(result[0].end, blocks[1].end)
+        XCTAssertEqual(result[1].start, blocks[2].start)
+        XCTAssertEqual(result[1].end, blocks[2].end)
+    }
+
+    // MARK: - fullyCovered
+
+    func testFullyCoveredExactMatch() {
+        let occupied = [block(0, 10)]
+        let b = block(0, 10)
+        XCTAssertTrue(fullyCovered(occupied, block: b, tolMin: 0))
+    }
+
+    func testFullyCoveredPartialOverlap() {
+        let occupied = [block(0, 5)]
+        let b = block(0, 10)
+        XCTAssertFalse(fullyCovered(occupied, block: b, tolMin: 0))
+    }
+
+    func testFullyCoveredWithTolerance() {
+        let occupied = [block(0, 10)]
+        let b = block(2, 8)
+        XCTAssertTrue(fullyCovered(occupied, block: b, tolMin: 5))
+    }
+
+    func testFullyCoveredMultipleSegments() {
+        let occupied = coalesce([block(0, 3), block(3, 10)])
+        let b = block(0, 10)
+        XCTAssertTrue(fullyCovered(occupied, block: b, tolMin: 0))
+    }
+
+    // MARK: - gapsWithin
+
+    func testGapsWithinNoOccupied() {
+        let b = block(0, 60)
+        let gaps = gapsWithin([], in: b)
+        XCTAssertEqual(gaps.count, 1)
+        XCTAssertEqual(gaps[0].start, b.start)
+        XCTAssertEqual(gaps[0].end, b.end)
+    }
+
+    func testGapsWithinSingleGap() {
+        let occupied = [block(0, 10), block(20, 30)]
+        let b = block(0, 30)
+        let gaps = gapsWithin(occupied, in: b)
+        XCTAssertEqual(gaps.count, 1)
+        XCTAssertEqual(gaps[0].start, occupied[0].end)
+        XCTAssertEqual(gaps[0].end, occupied[1].start)
+    }
+
+    func testGapsWithinMultipleGaps() {
+        let occupied = [block(5, 10), block(15, 20)]
+        let b = block(0, 30)
+        let gaps = gapsWithin(occupied, in: b)
+        XCTAssertEqual(gaps.count, 3)
+        XCTAssertEqual(gaps[0].start, b.start)
+        XCTAssertEqual(gaps[0].end, occupied[0].start)
+        XCTAssertEqual(gaps[1].start, occupied[0].end)
+        XCTAssertEqual(gaps[1].end, occupied[1].start)
+        XCTAssertEqual(gaps[2].start, occupied[1].end)
+        XCTAssertEqual(gaps[2].end, b.end)
+    }
+
+    func testGapsWithinExactFit() {
+        let occupied = [block(0, 10)]
+        let b = block(0, 10)
+        let gaps = gapsWithin(occupied, in: b)
+        XCTAssertTrue(gaps.isEmpty)
+    }
+
+    // MARK: - uniqueBlocks
+
+    func testUniqueBlocksByTime() {
+        let blocks = [block(0, 10), block(0, 10), block(10, 20)]
+        let result = uniqueBlocks(blocks, trackByID: false)
+        XCTAssertEqual(result.count, 2)
+    }
+
+    func testUniqueBlocksByID() {
+        let blocks = [
+            block(0, 10, id: "a"),
+            block(0, 10, id: "a"),
+            block(5, 15, id: "b")
+        ]
+        let result = uniqueBlocks(blocks, trackByID: true)
+        XCTAssertEqual(result.count, 2)
+    }
+
+    func testUniqueBlocksByIDDifferentOccurrence() {
+        let b1 = Block(start: d, end: d.addingTimeInterval(600), srcStableID: "a", label: nil, notes: nil, occurrence: d)
+        let b2 = Block(start: d, end: d.addingTimeInterval(600), srcStableID: "a", label: nil, notes: nil, occurrence: d.addingTimeInterval(3600))
+        let result = uniqueBlocks([b1, b2], trackByID: true)
+        XCTAssertEqual(result.count, 2)
+    }
+}

BusyMirrorTests/EventFiltersTests.swift

@@ -0,0 +1,92 @@
+import XCTest
+@testable import BusyMirror
+
+final class EventFiltersTests: XCTestCase {
+
+    // MARK: - isOutsideWorkHours
+
+    func testInsideWorkHours() {
+        var calendar = Calendar(identifier: .gregorian)
+        calendar.timeZone = TimeZone(identifier: "UTC")!
+        let date = calendar.date(from: DateComponents(year: 2024, month: 1, day: 1, hour: 10, minute: 0))!
+        XCTAssertFalse(isOutsideWorkHours(date, calendar: calendar, startMinutes: 9 * 60, endMinutes: 17 * 60))
+    }
+
+    func testOutsideWorkHoursBeforeStart() {
+        var calendar = Calendar(identifier: .gregorian)
+        calendar.timeZone = TimeZone(identifier: "UTC")!
+        let date = calendar.date(from: DateComponents(year: 2024, month: 1, day: 1, hour: 8, minute: 59))!
+        XCTAssertTrue(isOutsideWorkHours(date, calendar: calendar, startMinutes: 9 * 60, endMinutes: 17 * 60))
+    }
+
+    func testOutsideWorkHoursAtEndBoundary() {
+        var calendar = Calendar(identifier: .gregorian)
+        calendar.timeZone = TimeZone(identifier: "UTC")!
+        let date = calendar.date(from: DateComponents(year: 2024, month: 1, day: 1, hour: 17, minute: 0))!
+        XCTAssertTrue(isOutsideWorkHours(date, calendar: calendar, startMinutes: 9 * 60, endMinutes: 17 * 60))
+    }
+
+    func testOutsideWorkHoursInvalidRange() {
+        var calendar = Calendar(identifier: .gregorian)
+        calendar.timeZone = TimeZone(identifier: "UTC")!
+        let date = calendar.date(from: DateComponents(year: 2024, month: 1, day: 1, hour: 10, minute: 0))!
+        // end <= start means "no enforcement"
+        XCTAssertFalse(isOutsideWorkHours(date, calendar: calendar, startMinutes: 17 * 60, endMinutes: 9 * 60))
+    }
+
+    // MARK: - shouldSkip
+
+    func testShouldSkipEmptyFilters() {
+        XCTAssertFalse(shouldSkip(title: "Meeting", filters: [], titlePrefix: "🪞 "))
+    }
+
+    func testShouldSkipMatchingRawTitle() {
+        XCTAssertTrue(shouldSkip(title: "Standup", filters: ["standup"], titlePrefix: ""))
+    }
+
+    func testShouldSkipMatchingStrippedTitle() {
+        XCTAssertTrue(shouldSkip(title: "🪞 Standup", filters: ["standup"], titlePrefix: "🪞 "))
+    }
+
+    func testShouldSkipCaseInsensitive() {
+        XCTAssertTrue(shouldSkip(title: "STANDUP", filters: ["standup"], titlePrefix: ""))
+    }
+
+    func testShouldSkipNoMatch() {
+        XCTAssertFalse(shouldSkip(title: "Meeting", filters: ["standup"], titlePrefix: ""))
+    }
+
+    func testShouldSkipNilTitle() {
+        XCTAssertFalse(shouldSkip(title: nil, filters: ["standup"], titlePrefix: ""))
+    }
+
+    func testShouldSkipMultipleFilters() {
+        XCTAssertTrue(shouldSkip(title: "Lunch", filters: ["standup", "lunch"], titlePrefix: ""))
+    }
+
+    // MARK: - shouldSkipOrganizer
+
+    func testShouldSkipOrganizerEmptyFilters() {
+        XCTAssertFalse(shouldSkipOrganizer(organizerValues: ["alice@example.com"], filters: []))
+    }
+
+    func testShouldSkipOrganizerEmptyValues() {
+        XCTAssertFalse(shouldSkipOrganizer(organizerValues: [], filters: ["alice"]))
+    }
+
+    func testShouldSkipOrganizerMatch() {
+        XCTAssertTrue(shouldSkipOrganizer(organizerValues: ["Alice Smith", "alice@example.com"], filters: ["alice"]))
+    }
+
+    func testShouldSkipOrganizerCaseInsensitive() {
+        XCTAssertTrue(shouldSkipOrganizer(organizerValues: ["ALICE@EXAMPLE.COM"], filters: ["alice"]))
+    }
+
+    func testShouldSkipOrganizerPartialMatch() {
+        XCTAssertTrue(shouldSkipOrganizer(organizerValues: ["bob@corp.com"], filters: ["corp"]))
+    }
+
+    func testShouldSkipOrganizerNoMatch() {
+        XCTAssertFalse(shouldSkipOrganizer(organizerValues: ["charlie@example.com"], filters: ["alice"]))
+    }
+}

BusyMirrorTests/MirrorUtilsTests.swift

@@ -0,0 +1,143 @@
+import XCTest
+@testable import BusyMirror
+
+final class MirrorUtilsTests: XCTestCase {
+
+    // MARK: - stripPrefix
+
+    func testStripPrefixMatching() {
+        XCTAssertEqual(stripPrefix("🪞 Meeting", prefix: "🪞 "), "Meeting")
+    }
+
+    func testStripPrefixNoMatch() {
+        XCTAssertEqual(stripPrefix("Meeting", prefix: "🪞 "), "Meeting")
+    }
+
+    func testStripPrefixEmptyPrefix() {
+        XCTAssertEqual(stripPrefix("Meeting", prefix: ""), "Meeting")
+    }
+
+    func testStripPrefixNilTitle() {
+        XCTAssertEqual(stripPrefix(nil, prefix: "🪞 "), "")
+    }
+
+    // MARK: - mirrorURL encode/decode round-trip
+
+    func testMirrorURLEncodeDecodeRoundTrip() {
+        let raw = "abc|123://"
+        let encoded = mirrorURLComponentEncode(raw)
+        let decoded = mirrorURLComponentDecode(Substring(encoded))
+        XCTAssertEqual(decoded, raw)
+    }
+
+    func testMirrorURLAllowedCharactersUnchanged() {
+        let raw = "abcABC123-._~"
+        XCTAssertEqual(mirrorURLComponentEncode(raw), raw)
+    }
+
+    // MARK: - buildMirrorURL / parseMirrorURL
+
+    func testMirrorURLRoundTrip() {
+        let calID = "ABC-123"
+        let sourceID = "event-456"
+        let occ = Date(timeIntervalSince1970: 1000)
+        let start = Date(timeIntervalSince1970: 2000)
+        let end = Date(timeIntervalSince1970: 3600)
+
+        let url = buildMirrorURL(
+            targetCalID: calID,
+            sourceCalID: calID,
+            sourceStableID: sourceID,
+            occurrence: occ,
+            start: start,
+            end: end
+        )
+        XCTAssertNotNil(url)
+        XCTAssertTrue(url?.absoluteString.hasPrefix("mirror://x/") ?? false)
+
+        let parsed = parseMirrorURL(url)
+        XCTAssertEqual(parsed.targetCalID, calID)
+        XCTAssertEqual(parsed.sourceCalID, calID)
+        XCTAssertEqual(parsed.sourceStableID, sourceID)
+        XCTAssertEqual(parsed.occ?.timeIntervalSince1970, 1000)
+        XCTAssertEqual(parsed.start?.timeIntervalSince1970, 2000)
+        XCTAssertEqual(parsed.end?.timeIntervalSince1970, 3600)
+    }
+
+    func testMirrorURLWithSpecialCharacters() {
+        let calID = "cal|with/pipe"
+        let url = buildMirrorURL(
+            targetCalID: calID,
+            sourceCalID: "src",
+            sourceStableID: nil,
+            occurrence: nil,
+            start: Date(),
+            end: Date()
+        )
+        XCTAssertNotNil(url)
+        let parsed = parseMirrorURL(url)
+        XCTAssertEqual(parsed.targetCalID, calID)
+    }
+
+    func testParseMirrorURLInvalid() {
+        let parsed = parseMirrorURL(URL(string: "https://example.com"))
+        XCTAssertNil(parsed.targetCalID)
+        XCTAssertNil(parsed.sourceCalID)
+    }
+
+    func testParseMirrorURLMissingOptionalFields() {
+        let url = URL(string: "mirror://x/tgt;src;;-;;")
+        let parsed = parseMirrorURL(url)
+        XCTAssertEqual(parsed.targetCalID, "tgt")
+        XCTAssertEqual(parsed.sourceCalID, "src")
+        XCTAssertNil(parsed.sourceStableID)
+        XCTAssertNil(parsed.occ)
+        XCTAssertNil(parsed.start)
+        XCTAssertNil(parsed.end)
+    }
+
+    // MARK: - isMirrorEvent
+
+    func testIsMirrorEventByURL() {
+        XCTAssertTrue(isMirrorEvent(title: "Meeting", urlString: "mirror://x", prefix: "🪞 ", placeholder: "Busy"))
+    }
+
+    func testIsMirrorEventByPrefix() {
+        XCTAssertTrue(isMirrorEvent(title: "🪞 Meeting", urlString: nil, prefix: "🪞 ", placeholder: "Busy"))
+    }
+
+    func testIsMirrorEventByPlaceholder() {
+        XCTAssertTrue(isMirrorEvent(title: "Busy", urlString: nil, prefix: "", placeholder: "Busy"))
+    }
+
+    func testIsMirrorEventByPrefixedPlaceholder() {
+        XCTAssertTrue(isMirrorEvent(title: "🪞 Busy", urlString: nil, prefix: "🪞 ", placeholder: "Busy"))
+    }
+
+    func testIsMirrorEventNegative() {
+        XCTAssertFalse(isMirrorEvent(title: "Regular Meeting", urlString: nil, prefix: "🪞 ", placeholder: "Busy"))
+    }
+
+    // MARK: - key generators
+
+    func testSourceOccurrenceKey() {
+        let occ = Date(timeIntervalSince1970: 1234)
+        let key = sourceOccurrenceKey(sourceCalID: "cal1", sourceStableID: "evt1", occurrence: occ)
+        XCTAssertEqual(key, "cal1|evt1|1234.0")
+    }
+
+    func testSourceOccurrenceKeyNoOccurrence() {
+        let key = sourceOccurrenceKey(sourceCalID: "cal1", sourceStableID: "evt1", occurrence: nil)
+        XCTAssertEqual(key, "cal1|evt1|-")
+    }
+
+    func testMirrorRecordKey() {
+        XCTAssertEqual(mirrorRecordKey(targetCalID: "t", sourceKey: "s"), "t|s")
+    }
+
+    func testMirrorTimeKey() {
+        let s = Date(timeIntervalSince1970: 100)
+        let e = Date(timeIntervalSince1970: 200)
+        XCTAssertEqual(mirrorTimeKey(start: s, end: e), "100.0|200.0")
+    }
+}

CHANGELOG.md

@@ -0,0 +1,103 @@
+# Changelog
+
+All notable changes to BusyMirror will be documented in this file.
+
+## [1.5.0] - 2026-05-27
+
+### Removed
+- **Mark Private feature**: removed the non-functional server-side "Private" flagging for mirrored events. The Objective-C runtime hack (`setPrivate:`, KVC on `sensitivity`/`classification`) never worked reliably and would have blocked App Store review. This simplifies the UI and removes a private-API liability.
+
+### Changed
+- **Extracted mirror engine**: the ~500-line `runMirror` and `runCleanup` logic has been moved from `ContentView.swift` into a new `MirrorEngine.swift` class. `ContentView` now delegates to the engine via `makeEngine()`.
+- `MirrorRecord`, mirror index persistence, and `SAME_TIME_TOL_MIN` now live in the engine module.
+- `calLabel` moved to `MirrorUtils.swift` so it can be shared between UI and engine.
+
+### Build
+- Bump version to **1.5.0** (build **19**).
+
+## [1.4.0] - 2026-05-27
+
+### Fixed
+- **Sandbox LaunchAgent**: added `temporary-exception` entitlement so scheduled runs work in the sandboxed app.
+- **Mirror URL generation**: `buildMirrorURL` was silently broken — `URL(string:)` rejects raw `|` characters on current macOS, so mirror metadata URLs were always `nil`. Rebuilt with `URLComponents` using `;` separator and backward-compatible parser.
+- **Crash on Cleanup**: `runCleanup()` no longer crashes if the selected source calendar was removed.
+- **State corruption in multi-route runs**: `runConfiguredRoutes` no longer mutates global `@State` settings and restores them at the end of each loop; instead it passes a `MirrorConfig` struct into the engine.
+- **KVC safety**: removed misleading `do-catch` around `setValue:forKey:` in `setEventPrivateIfSupported()` (Objective-C exceptions are uncatchable in Swift).
+- **Log memory leak**: in-memory log now caps at 2,000 lines.
+- **CLI race**: `tryRunCLIIfPresent()` now preloads calendars when access is already granted, eliminating the 10-second timeout race.
+- **launchCtl output**: stdout and stderr now use separate pipes instead of interleaving into one.
+
+### Added
+- **Cancel button**: long-running mirrors now show a Cancel button; loops check `Task.isCancelled` for responsive cancellation.
+- **Progress indicator**: multi-route runs display `"Route X of Y"` in the status area.
+- **Unit tests**: 45 tests across `BlockMathTests`, `MirrorUtilsTests`, and `EventFiltersTests`.
+- **Extracted modules**: `BlockMath.swift`, `MirrorUtils.swift`, `EventFilters.swift`, and `MirrorConfig.swift` separate pure logic from the UI monolith.
+- **Target event cache**: target calendars shared across routes are fetched only once per run session.
+
+### Changed
+- `mergeGapMin` is now a computed property instead of redundant `@State`.
+- Log editor is now read-only (still selectable/copyable).
+- `SettingsPayload.excludedOrganizerFilters` is now non-optional for consistency.
+
+### Build
+- Bump minimum macOS version to `15.5` in `Info.plist`.
+- Bump version to **1.4.0** (build **18**).
+
+## [1.3.9] - 2026-04-09
+- New: add a macOS menu bar extra with `Sync Now`, `Open BusyMirror`, and `Quit BusyMirror`.
+- UX: menu bar sync requests reuse the existing mirror flow and can open the main window automatically when needed.
+- UX: BusyMirror now runs as a menu bar-only app and no longer appears in the Dock.
+- Build: bump version to 1.3.9 (build 17).
+
+## [1.3.8] - 2026-04-08
+- Fix: release ZIPs now package `BusyMirror.app` at the archive root instead of embedding the full build path.
+- Fix: release builds now apply an ad-hoc bundle signature before packaging so downloaded artifacts pass `codesign --verify --deep --strict`.
+- Build: suppress resource fork sidecars in release ZIPs via `ditto --norsrc --keepParent`.
+- Build: bump version to 1.3.8 (build 16).
+
+## [1.3.7] - 2026-03-24
+- Fix: mirror reconciliation now survives target providers that strip BusyMirror's custom event URL metadata.
+- Fix: moved and deleted source events are tracked via stable EventKit identifiers and a persisted local mirror index, so target placeholders update reliably.
+- Fix: mirror updates now detect title and notes changes, not just start/end time changes.
+- Build: bump version to 1.3.7 (build 15).
+
+## [1.3.6] - 2026-03-13
+- Scheduling: add in-app `Scheduled runs` controls to install or remove a user `launchd` LaunchAgent from BusyMirror itself.
+- Scheduling: support `Hourly`, `Daily`, and `Weekdays` schedules; hourly mode runs saved routes via `StartInterval`.
+- UX: generate and ship a proper macOS app icon set for BusyMirror.
+- Build: bump version to 1.3.6 (build 14).
+
+## [1.3.4] - 2026-03-13
+- Fix: route-scoped cleanup no longer deletes placeholders created by other source routes during the same multi-route run.
+- Fix: stale calendars are pruned from saved selections and routes during refresh, and refresh now recreates `EKEventStore` for a hard reload.
+- UX: the top bar `DRY RUN` / `WRITE` status pill is clickable, the left column keeps its own height on desktop, and the app can reveal its log file from the UI.
+- Logging: mirror activity is persisted to `~/Library/Logs/BusyMirror/BusyMirror.log` with simple rotation to `BusyMirror.previous.log`.
+- CLI: add `--run-saved-routes` so scheduled `launchd` runs can use the saved UI routes instead of fragile index-based route definitions.
+
+## [1.3.1] - 2025-10-13
+- Fix: auto-delete of mirrored placeholders when the source is removed now works even if no source instances remain in the window. Also cleans legacy mirrors without URLs by matching exact times.
+
+## [1.3.2] - 2025-10-13
+- New: Organizer filters — skip events by organizer (name/email/URL). UI under Options and persisted in settings.
+- CLI: add `--exclude-organizers` (and `--exclude-titles`) flags to control filters when running headless.
+
+## [1.2.4] - 2025-10-10
+- Fix: enable “Mirror Now” when Routes are defined even if no Source/Targets are checked in the main window. Button now enables if either routes exist or a manual selection is present.
+
+## [1.3.0] - 2025-10-10
+- New: Mark Private option to mirror with prefix + real title and set event privacy on supported servers; available globally and per-route; persisted.
+- Misc: calendar access fixes, concurrency annotations, accepted‑only filter, settings autosave/restore, Mirror Now enablement.
+
+## [1.2.3] - 2025-10-10
+- Fix: reliably save and restore settings between runs via autosave of key options and restoration of source/target selections by persistent IDs.
+- UX: persist Source and Target selections; rebuild indices on launch so UI matches saved IDs.
+- Build: bump version to 1.2.3 (build 5).
+
+## [1.2.1] - 2025-10-10
+- Fix: reinitialize EKEventStore after permission grant to avoid “Loaded 0 calendars” right after approval.
+- Fix: attendee status filter uses current user’s attendee `participantStatus == .accepted` instead of unavailable APIs.
+- Concurrency: mark `requestAccess()` and `reloadCalendars()` as `@MainActor` to satisfy strict concurrency checks.
+- Dev: add Makefile with `build-debug`, `build-release`, and `package` targets; produce versioned ZIP + SHA-256.
+
+## [1.2.0] - 2024-09-29
+- Feature: multi-route mirroring, overlap modes, merge gaps, work hours filter, CLI support, export/import settings.

Makefile

@@ -8,7 +8,7 @@ DEST := platform=macOS
 # Extract marketing version from project settings
 VERSION := $(shell sed -n 's/.*MARKETING_VERSION = \([0-9.]*\);.*/\1/p' $(PROJECT)/project.pbxproj | head -n1)
 
-.PHONY: all clean build-debug build-release open app package
+.PHONY: all clean build-debug build-release sign-app open app package
 
 all: build-release
 
@@ -31,16 +31,25 @@ open: app
 
 # Path to built app (Release)
 APP_PATH := $(DERIVED)/Build/Products/Release/BusyMirror.app
+SIGNED_APP_PATH := build/ReleaseSigned/BusyMirror.app
 
-app: build-release
+sign-app: build-release
+	@echo "Preparing signed release app…"
+	@rm -rf "$(SIGNED_APP_PATH)"
+	@mkdir -p "$(dir $(SIGNED_APP_PATH))"
+	@ditto "$(APP_PATH)" "$(SIGNED_APP_PATH)"
+	@xattr -rc "$(SIGNED_APP_PATH)"
+	@codesign --force --deep --sign - "$(SIGNED_APP_PATH)"
+	@codesign --verify --deep --strict --verbose=2 "$(SIGNED_APP_PATH)"
+
+app: sign-app
 	@# Ensure the app exists
-	@test -d "$(APP_PATH)" && echo "Built: $(APP_PATH)" || (echo "App not found at $(APP_PATH)" && exit 1)
+	@test -d "$(SIGNED_APP_PATH)" && echo "Built: $(SIGNED_APP_PATH)" || (echo "App not found at $(SIGNED_APP_PATH)" && exit 1)
 	@echo "Version: $(VERSION)"
 	@echo "OK"
 
 package: app
 	@echo "Packaging BusyMirror $(VERSION)…"
-	@zip -qry "BusyMirror-$(VERSION)-macOS.zip" "$(APP_PATH)"
+	@ditto --norsrc -c -k --keepParent "$(SIGNED_APP_PATH)" "BusyMirror-$(VERSION)-macOS.zip"
 	@shasum -a 256 "BusyMirror-$(VERSION)-macOS.zip" | awk '{print $$1}' > "BusyMirror-$(VERSION)-macOS.zip.sha256"
 	@echo "Created BusyMirror-$(VERSION)-macOS.zip and .sha256"
-

README.md

@@ -2,23 +2,71 @@
 
 BusyMirror mirrors meetings between your calendars so your availability stays consistent across accounts/devices.
 
-## What it does (current checkpoint)
-- Manual “Run” to mirror events across selected routes (Source → Targets).
-- DRY-RUN mode shows what would happen.
-- Prefix-based tagging of mirrored events.
-- Cleanup of placeholders (with confirmation).
-- Loop/duplicate guards so mirrors don’t replicate themselves.
-- Time window and merge-gap settings.
+On macOS, BusyMirror now runs as a menu bar app. Use the menu bar icon to sync manually or open the main window; it no longer appears in the Dock.
+
+## What it does (current)
+- Route-driven mirroring (multi-source): define Source → Targets routes and run them in one go.
+- Manual selection mirroring: pick a source and targets in the UI and run.
+- Two privacy modes:
+  - Private (hide details): mirrors placeholders with prefix + placeholder title (e.g., "🪞 Busy").
+  - Mark Private: mirrors prefix + real title, but marks events Private on supported servers (best-effort).
+- DRY-RUN mode: see what would be created/updated/deleted without writing.
+- Activity Log in the app plus persistent file logging on disk.
+- In-app scheduling: install or remove a `launchd` LaunchAgent from the `Scheduled runs` section.
+- Menu bar controls: trigger `Sync Now`, open the main window, or quit without keeping a Dock icon around.
+- Overlap modes: `allow`, `skipCovered`, `fillGaps`.
+- Merge adjacent events with a configurable gap.
+- Time window controls (days back/forward) and Work Hours filter.
+- Accepted-only filter (mirror your accepted meetings only).
+- Cleanup of placeholders, including auto-delete of mirrors whose source disappeared.
+- Refresh Calendars prunes stale saved calendars and routes when calendars are removed from the system.
+- Prefix-based tagging and loop guards to prevent re-mirroring mirrors.
+- Settings: autosave/restore, Import/Export JSON, saved routes for scheduled/headless runs.
 
 ## Why
 Use one calendar’s confirmed meetings to block time in other calendars (e.g., corporate iPad vs. personal devices).
 
 ## Build (macOS)
+Option A — Xcode
 1. Open `BusyMirror.xcodeproj` in Xcode.
 2. Select the BusyMirror scheme → My Mac.
 3. Product → Build.  
 4. Product → Archive → Distribute App → Copy App (no notarization) to export a `.app` (or ZIP it for sharing).
 
+Option B — Makefile (reproducible)
+- Build Release: `make build-release`
+- Package ZIP: `make package` (creates `BusyMirror-<version>-macOS.zip` + `.sha256`)
+- Built app: `build/DerivedData/Build/Products/Release/BusyMirror.app`
+
+See `CHANGELOG.md` for notable changes.
+
+## CLI (optional)
+- Run from Terminal with `--routes` to mirror without the UI. Example:
+  - `BusyMirror.app/Contents/MacOS/BusyMirror --routes "1->2,3; 4->5" --write 1 --days-forward 7 --mode allow --exit`
+- Run the routes already saved in the app settings:
+  - `BusyMirror.app/Contents/MacOS/BusyMirror --run-saved-routes --write 1 --exit`
+- Flags exist for privacy, all-day, merge gap, days window, overlap mode, cleanup, and filters.
+- Filters:
+  - `--exclude-titles "token1, token2"`
+  - `--exclude-organizers "alice@example.com, Example Org"`
+  - Tokens are comma or newline separated; matching is case-insensitive.
+
+## Logs
+- BusyMirror now writes a persistent log file to `~/Library/Logs/BusyMirror/BusyMirror.log`.
+- When the file grows large, the previous file is rotated to `~/Library/Logs/BusyMirror/BusyMirror.previous.log`.
+- `launchd` stdout/stderr for scheduled runs are also written in the same folder.
+- In the UI, use `Reveal Log File` to open the current log directly in Finder.
+
+## Scheduling
+- BusyMirror can create its own schedule from the app UI in `Scheduled runs`.
+- Choose `Hourly`, `Daily`, or `Weekdays`, then click `Install Schedule`.
+- The installed LaunchAgent runs:
+  - `/Applications/BusyMirror.app/Contents/MacOS/BusyMirror --run-saved-routes --write 1 --exit`
+- This is more stable than index-based `--routes`, because it uses the routes and per-route options you already configured in the UI.
+- Hourly schedules use `launchd` `StartInterval`; daily and weekday schedules use `StartCalendarInterval`.
+- You can remove the job from the same UI with `Remove Schedule`, and inspect the generated plist with `Reveal LaunchAgent`.
+- Note: scheduled headless runs depend on Calendar permission being granted to the installed app. Because these local builds are unsigned, macOS may require re-granting permission after replacing the app bundle with a new build.
+
 ## Roadmap
 See [ROADMAP.md](ROADMAP.md)
 

ROADMAP.md

@@ -1,17 +1,30 @@
 # BusyMirror Roadmap
 
+## Shipped (highlights)
+- Route-driven mirroring (multi-source)
+- Accepted-only filter (mirror your accepted meetings)
+- Persistent settings with autosave/restore; Import/Export JSON
+- Overlap modes (allow, skipCovered, fillGaps) and merge-gap
+- Work Hours filter and title-based skip filters
+- Privacy: placeholders with prefix + customizable title
+- 1.3.0: Mark Private option (global + per-route)
+- 1.3.4: persistent file logging, stale-calendar pruning on refresh, clickable top-bar mode toggle
+- 1.3.6: in-app scheduling via `launchd` with hourly/daily/weekday modes
+- 1.3.6: generated macOS app icon set and packaged release assets
+- 1.4.0: unit-test suite (45 tests), Cancel button, progress indicator, sandbox LaunchAgent fix, mirror URL fix, engine refactor into `MirrorConfig`
+
 ## Next
-- Source filters (name patterns like `[HOLD]`, `#nomirror`)
-- Mirror only **Accepted** meetings (exclude tentative/declined)
-- Persistent settings (routes, window, prefix)
-- Import/Export settings (.busymirror.json)
+- Auto-refresh calendars on `EKEventStoreChanged` (live refresh button-less)
+- Better scheduled-run diagnostics in the UI (last run / last error / next run)
+- Better server-side privacy mapping (per-provider heuristics)
 
 ## Then
-- iOS/iPadOS app (Run Now, Shortcuts, iCloud sync)
-- UI: route editor & clearer toggles
+- Signed/notarized binaries and release pipeline
+- CLI quality: friendlier `--routes` parsing and help flag
 - “Dry-run by default” preference
 
 ## Later
 - Background monitoring (macOS)
 - Smarter cleanup & conflict resolution
+- iOS/iPadOS helper (Shortcuts integration)
 - Profiles & MDM/Managed Config support

ReleaseNotes-1.2.3.md

@@ -0,0 +1,24 @@
+# BusyMirror 1.2.3 — 2025-10-10
+
+This release focuses on reliable settings persistence and quality-of-life fixes from the 1.2.1 hotfix.
+
+Highlights
+- Settings persist between runs: autosave key options on change; restore on launch.
+- Source/Target selection is remembered using calendar IDs and rehydrated into UI indices.
+
+Fixes and improvements
+- Save on change for: days back/forward, default merge gap, privacy/copy notes, all-day, accepted-only, overlap mode, title/placeholder prefixes, auto-delete.
+- Restore saved `selectedSourceID` and `selectedTargetIDs` and rebuild index selections.
+- Keep backward compatibility with older saved payloads.
+- Version bump to 1.2.3 (build 5).
+
+Included from 1.2.1
+- Reinitialize `EKEventStore` after permission grant to avoid “Loaded 0 calendars”.
+- Use attendee `participantStatus == .accepted` for accepted-only filter.
+- Mark `requestAccess()` and `reloadCalendars()` as `@MainActor`.
+- Makefile for reproducible builds and packaging.
+
+Build
+- `make build-release`
+- `make package` → BusyMirror-1.2.3-macOS.zip and .sha256
+

ReleaseNotes-1.2.4.md

@@ -0,0 +1,11 @@
+# BusyMirror 1.2.4 — 2025-10-10
+
+Bugfix release improving route-driven mirroring.
+
+Fixes
+- Mirror Now is enabled when routes are defined, even if nothing is checked in the main window. This allows fully route-driven runs without requiring a temporary manual selection.
+
+Build
+- `make build-release`
+- `make package` → BusyMirror-1.2.4-macOS.zip and .sha256
+

ReleaseNotes-1.3.0.md

@@ -0,0 +1,17 @@
+# BusyMirror 1.3.0 — 2025-10-10
+
+New
+- Mark Private option: mirror events with your prefix + real title while marking them Private on supported servers (e.g., Exchange). Co‑workers see the time block but not the details.
+- Per-route and global toggles for Mark Private; persists in settings and export/import.
+
+Fixes & improvements
+- More reliable calendar loading after permission grant (reinit EKEventStore).
+- Concurrency: `@MainActor` on permission/refresh methods.
+- Accepted‑only filter via current user attendee `participantStatus`.
+- Settings autosave and restore (including source/target selections by IDs).
+- Mirror Now enabled when calendars available; routes or manual selection used as appropriate.
+
+Build
+- `make build-release`
+- `make package` → BusyMirror-1.3.0-macOS.zip and .sha256
+

ReleaseNotes-1.3.1.md

@@ -0,0 +1,6 @@
+BusyMirror 1.3.1 — Bugfix Release
+
+- Fix: Auto-delete mirrored placeholders when the source event is removed.
+  - Triggers even if no source instances remain in the selected window.
+  - Also cleans legacy mirrors without mirror URLs by matching exact times.
+

ReleaseNotes-1.3.2.md

@@ -0,0 +1,11 @@
+BusyMirror 1.3.2 — 2025-10-13
+
+Changes
+- Organizer filters: skip mirroring events whose organizer matches a name, email, or URL token. Case-insensitive. Configure in Options.
+- CLI flags: `--exclude-organizers` and `--exclude-titles` accept comma/newline separated tokens. Example:
+  - `--routes "1->2" --write 1 --exclude-organizers "alice@example.com, Example Org" --exit`
+
+Notes
+- Export/Import settings now includes organizer filters (backwards compatible).
+- No changes to event URL format; feature is fully optional.
+

ReleaseNotes-1.3.3.md

@@ -0,0 +1,9 @@
+BusyMirror 1.3.3 — 2025-10-13
+
+Changes
+- UI: Options panel is scrollable to ensure new filters are always visible on smaller windows.
+- Organizer filter: skip by organizer name/email/URL; settings persisted; usable via CLI with `--exclude-organizers`.
+
+Build
+- Version bump to 1.3.3 (build stays 11).
+

ReleaseNotes-1.3.4.md

@@ -0,0 +1,11 @@
+BusyMirror 1.3.4 - 2026-03-13
+
+Changes
+- Fix multi-route cleanup so one source route no longer deletes mirrored placeholders created by another route.
+- Persist activity logs to `~/Library/Logs/BusyMirror/BusyMirror.log` and expose a `Reveal Log File` action in the app.
+- Add `--run-saved-routes` for headless runs using the routes configured in the UI, which makes `launchd` scheduling practical.
+- Improve calendar refresh by pruning stale saved identifiers and recreating the EventKit store.
+- Keep the left column from stretching to match the routes/log column on desktop layouts.
+
+Build
+- Version bump to 1.3.4 (build 12).

ReleaseNotes-1.3.6.md

@@ -0,0 +1,9 @@
+BusyMirror 1.3.6 - 2026-03-13
+
+Changes
+- Add in-app scheduling controls so BusyMirror can install and remove its own `launchd` LaunchAgent.
+- Support hourly saved-route runs in addition to daily and weekday schedules.
+- Ship a generated macOS app icon set for the app bundle and exported releases.
+
+Build
+- Version bump to 1.3.6 (build 14).

ReleaseNotes-1.3.7.md

@@ -0,0 +1,9 @@
+BusyMirror 1.3.7 - 2026-03-24
+
+Changes
+- Fix mirrored event tracking on providers that do not preserve BusyMirror's custom event URL metadata.
+- Track source events using stable EventKit identifiers and a local mirror index so moved and deleted source events update target calendars reliably.
+- Detect title and notes changes during reconciliation instead of only updating mirrors when times change.
+
+Build
+- Version bump to 1.3.7 (build 15).

ReleaseNotes-1.3.8.md

@@ -0,0 +1,9 @@
+BusyMirror 1.3.8 - 2026-04-08
+
+Changes
+- Fix release packaging so the ZIP contains `BusyMirror.app` at the archive root.
+- Apply an ad-hoc bundle signature before packaging so the distributed app bundle verifies correctly after unzip.
+- Strip resource fork sidecars from release archives to avoid malformed download contents.
+
+Build
+- Version bump to 1.3.8 (build 16).

ReleaseNotes-1.3.9.md

@@ -0,0 +1,9 @@
+BusyMirror 1.3.9 - 2026-04-09
+
+Changes
+- Add a menu bar extra with `Sync Now`, `Open BusyMirror`, and `Quit BusyMirror`.
+- Route menu bar sync requests through the same mirroring flow as the main window, opening the window automatically when needed.
+- Run BusyMirror as a menu bar-only app so it no longer appears in the Dock.
+
+Build
+- Version bump to 1.3.9 (build 17).