refactor(agent): move provider refresh into subsystem owners

nanobot/agent/loop.py

@@ -307,16 +307,9 @@ class AgentLoop:
         self.model = model
         self.context_window_tokens = context_window_tokens
         self.runner.provider = provider
-        self.subagents.provider = provider
-        self.subagents.model = model
-        self.subagents.runner.provider = provider
-        self.consolidator.provider = provider
-        self.consolidator.model = model
-        self.consolidator.context_window_tokens = context_window_tokens
-        self.consolidator.max_completion_tokens = provider.generation.max_tokens
-        self.dream.provider = provider
-        self.dream.model = model
-        self.dream._runner.provider = provider
+        self.subagents.set_provider(provider, model)
+        self.consolidator.set_provider(provider, model, context_window_tokens)
+        self.dream.set_provider(provider, model)
         self._provider_signature = snapshot.signature
         logger.info("Runtime model switched for next turn: {} -> {}", old_model, model)
 

nanobot/agent/memory.py

@@ -450,6 +450,17 @@ class Consolidator:
             weakref.WeakValueDictionary()
         )
 
+    def set_provider(
+        self,
+        provider: LLMProvider,
+        model: str,
+        context_window_tokens: int,
+    ) -> None:
+        self.provider = provider
+        self.model = model
+        self.context_window_tokens = context_window_tokens
+        self.max_completion_tokens = provider.generation.max_tokens
+
     def get_lock(self, session_key: str) -> asyncio.Lock:
         """Return the shared consolidation lock for one session."""
         return self._locks.setdefault(session_key, asyncio.Lock())
@@ -710,6 +721,11 @@ class Dream:
         self._runner = AgentRunner(provider)
         self._tools = self._build_tools()
 
+    def set_provider(self, provider: LLMProvider, model: str) -> None:
+        self.provider = provider
+        self.model = model
+        self._runner.provider = provider
+
     # -- tool registry -------------------------------------------------------
 
     def _build_tools(self) -> ToolRegistry:

nanobot/agent/subagent.py

@@ -96,6 +96,11 @@ class SubagentManager:
         self._task_statuses: dict[str, SubagentStatus] = {}
         self._session_tasks: dict[str, set[str]] = {}  # session_key -> {task_id, ...}
 
+    def set_provider(self, provider: LLMProvider, model: str) -> None:
+        self.provider = provider
+        self.model = model
+        self.runner.provider = provider
+
     async def spawn(
         self,
         task: str,

tests/agent/test_runtime_refresh.py

@@ -14,7 +14,7 @@ def _provider(default_model: str, max_tokens: int = 123) -> MagicMock:
     return provider
 
 
-def test_runtime_refresh_updates_loop_dependents(tmp_path: Path) -> None:
+def test_provider_refresh_updates_all_model_dependents(tmp_path: Path) -> None:
     old_provider = _provider("old-model")
     new_provider = _provider("new-model", max_tokens=456)
     loop = AgentLoop(