refactor: move runtime event publishing out of loop

tests/bus/test_runtime_events.py

@@ -1,9 +1,13 @@
 import pytest
 
+from nanobot.bus.events import InboundMessage
 from nanobot.bus.runtime_events import (
     RuntimeEventBus,
     RuntimeEventContext,
+    RuntimeEventPublisher,
     RuntimeModelChanged,
+    SessionTurnStarted,
+    TurnCompleted,
     TurnRunStatusChanged,
 )
 
@@ -46,3 +50,73 @@ async def test_runtime_event_bus_keeps_catch_all_subscription() -> None:
     await bus.publish(RuntimeModelChanged(model="m", model_preset=None))
 
     assert seen == ["RuntimeModelChanged"]
+
+
+@pytest.mark.asyncio
+async def test_runtime_event_publisher_builds_context_from_inbound_message() -> None:
+    bus = RuntimeEventBus()
+    seen: list[object] = []
+    publisher = RuntimeEventPublisher(bus)
+    msg = InboundMessage(
+        channel="websocket",
+        sender_id="user",
+        chat_id="chat-a",
+        content="hello",
+        metadata={"trace_id": "turn-1"},
+    )
+
+    bus.subscribe(seen.append)
+
+    await publisher.session_turn_started(msg, "websocket:chat-a")
+    await publisher.run_status_changed(
+        msg,
+        "websocket:chat-a",
+        "running",
+        started_at=12.5,
+    )
+
+    started = seen[0]
+    running = seen[1]
+    assert isinstance(started, SessionTurnStarted)
+    assert started.context.channel == "websocket"
+    assert started.context.chat_id == "chat-a"
+    assert started.context.session_key == "websocket:chat-a"
+    assert started.context.metadata == {"trace_id": "turn-1"}
+    assert started.context.metadata is not msg.metadata
+    assert isinstance(running, TurnRunStatusChanged)
+    assert running.status == "running"
+    assert running.started_at == 12.5
+
+
+@pytest.mark.asyncio
+async def test_runtime_event_publisher_consumes_turn_metadata_on_complete() -> None:
+    bus = RuntimeEventBus()
+    seen: list[object] = []
+    publisher = RuntimeEventPublisher(bus)
+
+    bus.subscribe(seen.append)
+    publisher.record_turn_runtime("cli:direct", "runtime")
+    publisher.record_turn_latency("cli:direct", 123)
+
+    await publisher.turn_completed(
+        channel="cli",
+        chat_id="direct",
+        session_key="cli:direct",
+        metadata={"source": "test"},
+    )
+    await publisher.turn_completed(
+        channel="cli",
+        chat_id="direct",
+        session_key="cli:direct",
+        metadata=None,
+    )
+
+    first = seen[0]
+    second = seen[1]
+    assert isinstance(first, TurnCompleted)
+    assert first.context.metadata == {"source": "test"}
+    assert first.latency_ms == 123
+    assert first.runtime == "runtime"
+    assert isinstance(second, TurnCompleted)
+    assert second.latency_ms is None
+    assert second.runtime is None