[F067] flow_main_pm: add missing /triage route

main_pm's manifest advertises triage (lifecycle.intents_for_role(MAIN_PM)
includes it via _PM_ROLES, alongside triage_all) but flow_main_pm.py had no
POST /triage route, so a main_pm agent calling triage hit a raw 404 that
bypassed the per-verb circuit breaker. Added the route mirroring flow_cell_pm's
/triage — wires to the existing team-scoped choreographer.triage (uses pm.team,
works for any PM role; Main PM gets its own team's blocked/awaiting tasks).
Fix direction: add-route, NOT remove-from-manifest — the manifest is spec-correct
(intents_for_role by construction); removing triage would contradict the spec
and leave main_pm with only cross-team triage_all. TDD: test_triage_route_exists_and_dispatches.

tests/unit/api/routes/v1/test_flow_main_pm.py

@@ -362,3 +362,26 @@ async def test_resume_dispatches() -> None:
     )
     assert resp.status_code == _HTTP_200
     mock_chore.resume.assert_awaited_once()
+
+
+@pytest.mark.asyncio
+async def test_triage_route_exists_and_dispatches() -> None:
+    """F067: POST /api/v1/flow/main_pm/triage must exist and wire to
+    choreographer.triage. The main_pm manifest (from lifecycle.intents_for_role)
+    advertises `triage` alongside `triage_all`, so a main_pm agent calling
+    `triage` must hit a real route — not a raw 404 that bypasses the circuit
+    breaker. Mirrors flow_cell_pm's /triage route (the choreographer.triage
+    impl is team-scoped and works for any PM role).
+    """
+    mock_chore = MagicMock()
+    mock_chore.triage = AsyncMock(return_value=_make_envelope(status="idle"))
+    client = TestClient(_build_app(mock_chore))
+    resp = client.post(
+        "/api/v1/flow/main_pm/triage",
+        json={},
+        headers=_HEADERS,
+    )
+    assert resp.status_code == _HTTP_200, resp.text
+    body = resp.json()
+    assert body["status"] == "idle"
+    mock_chore.triage.assert_awaited_once()