feat(F): F-TEST + F-DOC + F-UI-TRIG — Phase F complete!

- F-TEST: tests/test_phase_f_agents.py (1425 lines, 45 tests, all pass) — ReAct Loop, Permissions, Approvals, Skills, Context Builder, Data Policy, Transparency, Workstream, Budget
- F-DOC: docs/api-documentation.md (Phase F endpoints), docs/plugin-development-guide.md (Agent chapter 32), docs/test-strategy.md (Phase F test conventions)
- F-UI-TRIG: trigger_dispatcher dispatches agents on ui.*/context.* events (already implemented in F-PROACTIVE)
- Bug fix: approval.py metadata reserved attribute renamed to request_metadata
- PROGRESS.md: Phase F marked done, ~155/223 tasks done (70%)

app/routes/approvals.py

@@ -99,7 +99,7 @@ def _to_response(r: ApprovalRequest) -> ApprovalResponse:
         created_at=r.created_at.isoformat() if r.created_at else None,
         resolved_at=r.resolved_at.isoformat() if r.resolved_at else None,
         expires_at=r.expires_at.isoformat() if r.expires_at else None,
-        metadata=r.metadata or {},
+        metadata=r.request_metadata or {},
     )