[F036] orchestrator: read transcript for overload detection too

The SDK server writes model-API errors (529/500/503) to /tmp/sdk-server.log,
not stdout, so an overload marker can appear only in the durable Claude
transcript — the same rationale already applied to the session-limit
detector. _provider_overload_park_target read only docker logs, so an
overload was missed and the agent crash-respawned straight back into it.

Now concatenates the transcript tail before matching, mirroring the
rate-limit path.

roboco/runtime/orchestrator.py

@@ -6413,7 +6413,13 @@ Start by:
         if provider_type not in (None, ModelProvider.ANTHROPIC.value):
             return None
         tail = await self._tail_container_logs(f"roboco-agent-{agent_id}")
-        lowered = tail.lower()
+        # F036: the SDK server writes model-API errors to /tmp/sdk-server.log,
+        # not stdout, so the overload marker (529/500/503) may appear only in
+        # the durable Claude transcript — the same rationale already applied to
+        # the session-limit detector. Without the transcript an overload is
+        # missed and the agent crash-respawns straight back into it.
+        transcript_tail = self._transcript_tail_text(agent_id)
+        lowered = (tail + "\n" + transcript_tail).lower()
         if any(marker in lowered for marker in _ANTHROPIC_OVERLOAD_MARKERS):
             return ModelProvider.ANTHROPIC.value
         return None

tests/unit/runtime/test_provider_overload_break.py

@@ -103,6 +103,26 @@ async def test_clean_output_is_not_overload(
     assert await orch._provider_overload_park_target("be-dev-1", _instance()) is None
 
 
+@pytest.mark.asyncio
+async def test_detects_overload_marker_in_transcript(
+    orch: AgentOrchestrator, monkeypatch: pytest.MonkeyPatch
+) -> None:
+    # F036: the SDK server writes model-API errors to /tmp/sdk-server.log, not
+    # stdout, so the overload marker (529/500/503) may appear only in the durable
+    # Claude transcript — exactly the rationale already applied to the
+    # session-limit detector. Without reading the transcript here an overload
+    # is missed and the agent crash-respawns straight back into it.
+    monkeypatch.setattr(settings, "overload_break_enabled", True)
+    monkeypatch.setattr(orch, "_tail_container_logs", AsyncMock(return_value=""))
+    monkeypatch.setattr(
+        orch, "_transcript_tail_text", lambda _a, _lines=80: _OVERLOAD_LOG
+    )
+    assert (
+        await orch._provider_overload_park_target("be-dev-1", _instance())
+        == "anthropic"
+    )
+
+
 @pytest.mark.asyncio
 async def test_disabled_flag_never_parks(
     orch: AgentOrchestrator, monkeypatch: pytest.MonkeyPatch