refactor(agent): make runner consume required runtime

nanobot/agent/loop.py

@@ -301,12 +301,13 @@ class AgentLoop:
         # One file-read/write tracker per logical session. The tool registry is
         # shared by this loop, so tools resolve the active state via contextvars.
         self._file_state_store = FileStateStore()
-        self.runner = AgentRunner(provider)
+        self.runner = AgentRunner()
         self.subagents = SubagentManager(
             provider=provider,
             workspace=workspace,
             bus=bus,
             model=self.model,
+            context_window_tokens=self.context_window_tokens,
             tools_config=_tc,
             max_tool_result_chars=self.max_tool_result_chars,
             restrict_to_workspace=restrict_to_workspace,
@@ -456,8 +457,7 @@ class AgentLoop:
         self.provider = provider
         self.model = model
         self.context_window_tokens = context_window_tokens
-        self.runner.provider = provider
-        self.subagents.set_provider(provider, model)
+        self.subagents.set_provider(provider, model, context_window_tokens)
         self.consolidator.set_provider(provider, model, context_window_tokens)
         self._sync_replay_max_messages()
         self._provider_signature = snapshot.signature
@@ -864,7 +864,7 @@ class AgentLoop:
             result = await self.runner.run(AgentRunSpec(
                 initial_messages=initial_messages,
                 tools=effective_tools,
-                model=self.model,
+                runtime=self.llm_runtime(),
                 max_iterations=self.max_iterations,
                 max_tool_result_chars=self.max_tool_result_chars,
                 hook=hook,
@@ -872,7 +872,6 @@ class AgentLoop:
                 concurrent_tools=True,
                 workspace=effective_scope.project_path,
                 session_key=session.key if session else None,
-                context_window_tokens=self.context_window_tokens,
                 context_block_limit=self.context_block_limit,
                 provider_retry_mode=self.provider_retry_mode,
                 progress_callback=on_progress,