chore(openspec): archive all completed changes, sync 14 new specs to library

Archived 4 completed OpenSpec changes (2026-04-02):
- phase-3-enterprise (100/100 tasks) — 6 Phase 3 capabilities synced
- devops-documentation (48/48 tasks) — 3 new + 1 merged capability
- bedroom-developer-docs (33/33 tasks) — 4 new capabilities synced
- engineering-docs (superseded by 2026-03-29 archive) — no tasks

Main spec library grows from 21 → 35 capabilities (+14 new):
federation, multi-tenancy, oidc, soc2, w3c-dids, webhooks,
database, operations, system-overview, api-reference, core-concepts,
developer-guides, quick-start + deployment (merged additive requirements)

Active changes: 0 — project board is clear for Phase 4 planning.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

openspec/changes/archive/2026-04-02-devops-documentation/specs/operations/spec.md

@@ -0,0 +1,7 @@
+## ADDED Requirements
+
+### Requirement: Security guide exists at docs/devops/security.md
+The system SHALL provide `docs/devops/security.md` documenting RSA keypair generation, key rotation procedure, CORS configuration, and secret storage guidance.
+
+### Requirement: Operations runbook exists at docs/devops/operations.md
+The system SHALL provide `docs/devops/operations.md` covering startup procedure, graceful shutdown (SIGTERM/SIGINT), log interpretation, and troubleshooting for the most common operational failures.