Release 1.6.1

- Sync reminders: new "Sync reminders when mirroring" option (global and
  per-route) copies source event alarms into mirrored placeholders. CLI flag
  --sync-reminders.
- CLI polish: --help, --list-calendars, --status (all support --json).
  Scheduled/headless runs record last-run time/result/summary. Failure paths
  now exit with distinct nonzero codes (2 = no calendar access, 3 = no saved
  routes) instead of always exiting 0.
- Fix settings silently wiped on upgrade: SettingsPayload's auto-synthesized
  Codable threw on any settings blob missing a field added since (e.g. the
  new syncReminders key), failing the whole decode and letting the next
  autosave persist an empty state over real routes/filters. Custom decode
  now falls back per-field like Route already did, and loadSettingsFromDefaults
  recovers routes from the legacy routes.v1 key if settings.v2 comes back
  empty, repairing installs already hit by this.
- Roadmap: event-driven background sync (SMAppService + EKEventStoreChanged +
  wake notification) and an external MCP wrapper around the CLI queued next;
  decided against direct Google/CalDAV API integration since EventKit already
  covers it via System Settings accounts.

All 47 unit tests pass (45 existing + 2 new SettingsPayloadTests).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

BusyMirrorTests/BlockMathTests.swift

@@ -5,14 +5,15 @@ final class BlockMathTests: XCTestCase {
 
     private let d = Date(timeIntervalSince1970: 0)
 
-    private func block(_ startMin: Int, _ endMin: Int, id: String? = nil) -> Block {
+    private func block(_ startMin: Int, _ endMin: Int, id: String? = nil, alarmOffsets: [TimeInterval]? = nil) -> Block {
         Block(
             start: d.addingTimeInterval(TimeInterval(startMin * 60)),
             end: d.addingTimeInterval(TimeInterval(endMin * 60)),
             srcStableID: id,
             label: nil,
             notes: nil,
-            occurrence: nil
+            occurrence: nil,
+            alarmOffsets: alarmOffsets
         )
     }
 
@@ -44,6 +45,21 @@ final class BlockMathTests: XCTestCase {
         XCTAssertTrue(mergeBlocks([], gapMinutes: 10).isEmpty)
     }
 
+    func testMergeBlocksPreservesFirstAlarms() {
+        let b1 = block(0, 10, alarmOffsets: [-900, -3600])
+        let b2 = block(10, 20, alarmOffsets: [-600])
+        let merged = mergeBlocks([b1, b2], gapMinutes: 0)
+        XCTAssertEqual(merged.count, 1)
+        XCTAssertEqual(merged[0].alarmOffsets, [-900, -3600])
+    }
+
+    func testBlockEqualityIgnoresAlarms() {
+        let b1 = block(0, 10, alarmOffsets: [-900])
+        let b2 = block(0, 10, alarmOffsets: [-1800])
+        XCTAssertEqual(b1, b2)
+        XCTAssertEqual(Set([b1, b2]).count, 1)
+    }
+
     func testMergeBlocksUnsortedInput() {
         let blocks = [block(30, 40), block(0, 10), block(10, 20)]
         let merged = mergeBlocks(blocks, gapMinutes: 0)
@@ -150,8 +166,8 @@ final class BlockMathTests: XCTestCase {
     }
 
     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 b1 = Block(start: d, end: d.addingTimeInterval(600), srcStableID: "a", label: nil, notes: nil, occurrence: d, alarmOffsets: nil)
+        let b2 = Block(start: d, end: d.addingTimeInterval(600), srcStableID: "a", label: nil, notes: nil, occurrence: d.addingTimeInterval(3600), alarmOffsets: nil)
         let result = uniqueBlocks([b1, b2], trackByID: true)
         XCTAssertEqual(result.count, 2)
     }