docs: Update Metrics Agent Phase 3 project documentation

[ashleyshaw]

Summary

Update Metrics Agent Phase 3 project documentation to reflect the latest merged work, verify all linked issues have accurate status, and ensure OpenSpec compliance.

Changes

Project README Updates

• ✅ Updated issue numbers from placeholders (#3101-#3105) to actual issue numbers (Task 3.1: Production Deployment — Metrics Workflow #2126-Task 3.5: Validation & Refinement — Accuracy/Performance #2130)
• ✅ Mark Task 3.1 (Production Deployment) as complete (merged PR feat: Metrics Agent Phase 3 Task 3.1 — Production Deployment #2131 on 2026-08-20)
• ✅ Mark Task 3.2 (Integration Adapters) as complete with actual implementation details:
  • Meta Agent Adapter (249 LOC) with caching and anomaly detection
  • Reporting Agent Formatter (351 LOC) supporting weekly/monthly/quarterly reports
  • GitHub Issue Templates Generator (344 LOC) with threshold-based alerting
  • Comprehensive test suite (84+ tests, 99%+ coverage, 1,175 LOC tests)
• ✅ Updated Related Issues table with current PR links and completion status
• ✅ Updated Timeline section to reflect actual completion dates (2026-08-20)
• ✅ Updated Project Status table with completed Task 3.1-3.2 metrics

Task Documentation Updates

• ✅ Updated TASK_3.1_PRODUCTION_DEPLOYMENT.md with completion status and merged PR feat: Metrics Agent Phase 3 Task 3.1 — Production Deployment #2131
• ✅ Updated TASK_3.2_INTEGRATION_PLAN.md with:
  • Completion status and merged PR feat: Metrics Agent Phase 3 Task 3.1 — Production Deployment #2131
  • Actual implementation details with metrics
  • Timeline reflecting actual merge date
  • Detailed summary of all three adapters and test coverage

CHANGELOG Update

• ✅ Added Task 3.1 CHANGELOG entry documenting production deployment work (PR feat: Metrics Agent Phase 3 Task 3.1 — Production Deployment #2131)
  • Workflow scheduling (daily 2 AM UTC)
  • Slack failure notifications integration
  • Configuration documentation and production readiness

Test Coverage

• Task 3.1: Production Deployment workflow ✅
• Task 3.2: Integration Adapters - 84+ tests, 99%+ coverage ✅

Phase 3 Status

• ✅ Task 3.1 Complete (Production Deployment)
• ✅ Task 3.2 Complete (Integration Adapters)
• 🟡 Task 3.3 Planned (Monitoring & Alerting)
• 🟡 Task 3.4 Planned (Team Training)
• 🟡 Task 3.5 Planned (Validation & Refinement)

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🚫 This PR description is missing required template content.

Missing required section(s): Linked issues, Changelog, Global DoD checklist

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