Add Phase 10-12 implementation: multi-tenant, marketplace, observability

Major additions:
- marketplace/: Agent template registry with FTS5 search, ratings, versioning
- observability/: Prometheus metrics, distributed tracing, structured logging
- ledger/migrations/: Database migration scripts for multi-tenant support
- tests/governance/: 15 new test files for phases 6-12 (295 total tests)
- bin/validate-phases: Full 12-phase validation script

New features:
- Multi-tenant support with tenant isolation and quota enforcement
- Agent marketplace with semantic versioning and search
- Observability with metrics, tracing, and log correlation
- Tier-1 agent bootstrap scripts

Updated components:
- ledger/api.py: Extended API for tenants, marketplace, observability
- ledger/schema.sql: Added tenant, project, marketplace tables
- testing/framework.ts: Enhanced test framework
- checkpoint/checkpoint.py: Improved checkpoint management

Archived:
- External integrations (Slack/GitHub/PagerDuty) moved to .archive/
- Old checkpoint files cleaned up

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

testing/oversight/STATUS.md

@@ -0,0 +1,52 @@
+# Status: Testing Oversight
+
+## Current Phase
+
+**COMPLETE** (All oversight modules implemented)
+
+## Summary
+
+Testing oversight framework for governance validation, error injection, and quality reporting.
+
+## Tasks
+
+| Status | Task | Updated |
+|--------|------|---------|
+| ✓ | Bug watcher implementation | 2026-01-23 |
+| ✓ | Council module (review system) | 2026-01-23 |
+| ✓ | Error injector for chaos testing | 2026-01-24 |
+| ✓ | Phase validator | 2026-01-23 |
+| ✓ | Pipeline oversight | 2026-01-23 |
+| ✓ | Reporter module | 2026-01-23 |
+| ✓ | Suggestion engine | 2026-01-23 |
+
+## Files
+
+| File | Purpose |
+|------|---------|
+| `bug_watcher.py` | Monitors and tracks bugs across the system |
+| `council.py` | Multi-reviewer consensus system |
+| `error_injector.py` | Chaos testing via controlled error injection |
+| `phase_validator.py` | Validates phase transitions and requirements |
+| `pipeline.py` | Pipeline oversight and monitoring |
+| `reporter.py` | Generates oversight reports |
+| `suggestion_engine.py` | AI-powered improvement suggestions |
+| `README.md` | Module documentation |
+
+## Subdirectories
+
+| Directory | Purpose |
+|-----------|---------|
+| `reports/` | Generated oversight reports |
+
+## Dependencies
+
+- SQLite (`bug_watcher.db`)
+- Governance ledger
+
+## Issues / Blockers
+
+None.
+
+---
+*Last updated: 2026-01-24*