refactor: subscribe to runtime event types

tests/bus/test_runtime_events.py

@@ -0,0 +1,48 @@
+import pytest
+
+from nanobot.bus.runtime_events import (
+    RuntimeEventBus,
+    RuntimeEventContext,
+    RuntimeModelChanged,
+    TurnRunStatusChanged,
+)
+
+
+@pytest.mark.asyncio
+async def test_runtime_event_bus_filters_by_event_type() -> None:
+    bus = RuntimeEventBus()
+    seen: list[str] = []
+
+    async def handle_run_status(event: TurnRunStatusChanged) -> None:
+        seen.append(event.status)
+
+    bus.subscribe(handle_run_status, TurnRunStatusChanged)
+
+    await bus.publish(RuntimeModelChanged(model="m", model_preset=None))
+    await bus.publish(
+        TurnRunStatusChanged(
+            context=RuntimeEventContext(
+                channel="cli",
+                chat_id="direct",
+                session_key="cli:direct",
+            ),
+            status="running",
+        )
+    )
+
+    assert seen == ["running"]
+
+
+@pytest.mark.asyncio
+async def test_runtime_event_bus_keeps_catch_all_subscription() -> None:
+    bus = RuntimeEventBus()
+    seen: list[str] = []
+
+    def handle_any(event) -> None:
+        seen.append(type(event).__name__)
+
+    bus.subscribe(handle_any)
+
+    await bus.publish(RuntimeModelChanged(model="m", model_preset=None))
+
+    assert seen == ["RuntimeModelChanged"]