feat: Document completed tasks for KMS, Cryptography, and Plugin Libraries

- Added detailed task completion records for KMS interface implementation and CLI support for file-based keys.
- Documented security enhancements including Argon2id password hashing, audit event contracts, and rate limiting configurations.
- Included scoped service support and integration updates for the Plugin platform, ensuring proper DI handling and testing coverage.

docs/updates/2025-10-30-devops-governance.md

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+# 30 Oct 2025 — Governance rules anchor consolidated
+
+**What changed**
+
+- Published `docs/devops/contracts-and-rules.md` capturing the Sprint 33 governance rules:
+  1. API Gateway remains a proxy; Policy Engine composes overlays/simulations.
+  2. AOC ingestion persists upstream truth only (no merge/deduplicate logic).
+  3. Graph platform standardised on Graph Indexer + Graph API (Cartographer retired).
+- Updated backlog hygiene note (`docs/backlog/2025-10-cleanup.md`) and archived the Cartographer handshake plan to point at the new graph platform.
+- Logged the rules in `ops/devops/TASKS.md` and `docs/implplan/SPRINTS.md`, removing duplicate references to Cartographer as an active service.
+
+**Reviewers / acknowledgements**
+
+- Platform Leads (DevOps + Graph) confirmed the retirement of Cartographer in favour of Graph Indexer + Graph API.
+- Policy Engine Guild acknowledged the proxy-only Gateway posture and downstream overlay ownership.
+
+See `DEVOPS-RULES-33-001` for the owning task.