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- engineering-docs (superseded by 2026-03-29 archive) — no tasks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-engineering-docs/specs/testing-strategy/spec.md

@@ -0,0 +1,32 @@
+## ADDED Requirements
+
+### Requirement: Testing strategy document
+The system SHALL include a document (`docs/engineering/09-testing.md`) that explains the test architecture, how to run tests, coverage requirements, and how to write new tests following project conventions.
+
+#### Scenario: Test types and their purposes explained
+- **WHEN** a new engineer reads 09-testing.md
+- **THEN** they SHALL understand the distinction between: unit tests (test one service/util in isolation, mock all dependencies, no running services needed) and integration tests (test full HTTP request/response cycle with real PostgreSQL + Redis)
+
+#### Scenario: Test framework stack documented
+- **WHEN** a new engineer reads 09-testing.md
+- **THEN** they SHALL find the test stack listed and explained: Jest 29.7 (test runner + assertions), ts-jest (TypeScript compilation), Supertest 6.3 (HTTP integration testing), and how each is configured
+
+#### Scenario: Coverage gates documented
+- **WHEN** a new engineer reads 09-testing.md
+- **THEN** they SHALL know the mandatory gates: >80% statements, >80% branches, >80% functions, >80% lines — and that PRs below these thresholds are blocked
+
+#### Scenario: How to run the test suite documented
+- **WHEN** a new engineer wants to run tests
+- **THEN** the guide SHALL show: `npm test` (unit tests, no services), `npm run test:coverage` (unit tests + coverage report), `npm run test:integration` (requires Docker stack), and `npx jest src/services/agentService.test.ts` (single file)
+
+#### Scenario: Unit test writing conventions shown
+- **WHEN** a new engineer writes a new unit test
+- **THEN** the guide SHALL show a complete example: how to mock a repository with `jest.mock()`, how to structure `describe`/`it` blocks, how to assert on thrown errors, and how to verify mock calls — using an actual test from the codebase as the example
+
+#### Scenario: Integration test writing conventions shown
+- **WHEN** a new engineer writes a new integration test
+- **THEN** the guide SHALL show a complete example using Supertest: how to boot the Express app, how to seed test data, how to make authenticated requests (including getting a JWT first), and how to clean up after the test
+
+#### Scenario: OWASP security testing reference included
+- **WHEN** a new engineer writes security-relevant code
+- **THEN** the guide SHALL include a reference to the OWASP Top 10 checks that are verified in QA sign-off and what each means in the context of this codebase (SQL injection, JWT attacks, credential exposure, etc.)