feat: Add sovereign tool stack and integrate ASTRAL/AOC across playbooks

New document: Sovereign Tool Stack — complete capability map for our
open-source consulting arsenal.

Documents updated:
- sovereign-tool-stack.md (new): Maps Prowler, BloodHound, CISO Assistant,
  Purple Knight/Forest Druid, ASTRAL, and AOC to engagement modules and
  antifragile pillars. Identifies 6 gaps with recommended closes:
  Wazuh+Sysmon (EDR), Shuffle (SOAR), TheHive+Cortex (case management),
  Cartography (cloud asset mapping), Syft+Grype+Trivy (containers),
  Zeek+Suricata (network analysis). Includes per-module tool pairing,
  deployment complexity matrix, and integration architecture.
- m365-e3-hardening.md: Added ASTRAL 'configuration immunity' section
  and AOC audit log integration references
- endpoint-management-entry-vector.md: Added ASTRAL for Intune
  configuration backup and drift detection
- modular-engagements.md: Added ASTRAL and AOC to Module 1/2/3
  deliverables; linked sovereign tool stack
- retained-capability.md: Added AOC and Wazuh to detection engineering
  description
- ai-assisted-tvm.md: Added AOC and Prowler to discovery layer table
- blue-purple-team-foundation.md: Added sovereign tool stack reference
  for open-source SOC architecture
- zero-budget-hardening.md: Linked sovereign tool stack
- README.md + index.md: Added sovereign-tool-stack.md to navigation

antifragile-consulting/playbooks/ai-assisted-tvm.md

@@ -70,6 +70,8 @@ AI-assisted TVM does not replace basic hygiene. It **accelerates it by an order
 | **Cloud security posture** (Defender for Cloud, Prisma, Wiz) | Cloud resource misconfigurations | AI identifies cloud-specific kill chains (e.g., overly permissive S3 → compromised IAM → lateral movement) |
 | **Zero-budget discovery** (PowerShell, SSH scripts, Syft/Grype, osquery) | Server inventory, SBOMs, package-level CVE correlation | AI aggregates script-based findings into unified risk view. See [Zero-Budget Vulnerability Discovery](zero-budget-vulnerability-discovery.md) |
 | **osquery + FleetDM** | Cross-platform endpoint inventory, real-time process/network data, policy compliance | AI queries live endpoint state for prioritization and kill chain simulation. See [Osquery: The Sovereign Discovery Platform](osquery-custom-platform.md) |
+| **AOC (Admin Operations Center)** | M365 audit log intelligence, anomalous admin behaviour, privilege escalation detection | AI enriches insider-threat context with external vulnerability data for complete kill chain picture. See [Sovereign Tool Stack](sovereign-tool-stack.md) |
+| **Prowler** | Multi-cloud security posture (AWS, Azure, GCP) | AI correlates cloud misconfigurations with endpoint and identity findings for cross-layer risk scoring. See [Sovereign Tool Stack](sovereign-tool-stack.md) |
 | **Attack surface management** (Cortex Xpanse, Shodan, Nuclei, Amass) | External-facing assets unknown to IT | AI maps shadow IT and forgotten assets faster than manual discovery. See [Perimeter Scanning Capability](perimeter-scanning-capability.md) |
 | **Software bill of materials (SBOM)** | Known vulnerable components in applications | AI monitors SBOMs against real-time CVE disclosure and exploit availability |