test(#141): add Non-AI Coordinator integration tests
Comprehensive E2E validation proving coordinator enforces quality
gates and prevents premature completion claims.
Test scenarios (21 tests):
- Rejection Flow: Build/lint/test/coverage gate failures
- Acceptance Flow: All gates pass, required-only pass
- Continuation Flow: Retry, escalation, attempt tracking
- Escalation Flow: Manual review, notifications, history
- Configuration: Workspace-specific, defaults, custom gates
- Performance: Timeout compliance, memory limits
- Complete E2E: Full rejection-continuation-acceptance cycle
Fixtures:
- mock-agent-outputs.ts: Simulated gate execution results
- mock-gate-configs.ts: Various gate configurations
Validates integration of:
- Quality Orchestrator (#134)
- Quality Gate Config (#135)
- Completion Verification (#136)
- Continuation Prompts (#137)
- Rejection Handler (#139)
All 21 tests passing
Fixes #141
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>