fix(agent): prevent outer wall-clock timeout for streaming requests

nanobot/agent/runner.py

@@ -669,14 +669,25 @@ class AgentRunner:
         else:
             coro = self.provider.chat_with_retry(**kwargs)
 
+        # Streaming requests already have provider-level idle timeouts
+        # (NANOBOT_STREAM_IDLE_TIMEOUT_S). Do not also apply the outer wall-clock
+        # LLM timeout here, or healthy long reasoning streams can be killed just
+        # because total elapsed time exceeded NANOBOT_LLM_TIMEOUT_S.
+        outer_timeout_s = None if (wants_streaming or wants_progress_streaming) else timeout_s
         try:
             response = (
-                await coro if timeout_s is None
-                else await asyncio.wait_for(coro, timeout=timeout_s)
+                await coro if outer_timeout_s is None
+                else await asyncio.wait_for(coro, timeout=outer_timeout_s)
             )
         except asyncio.TimeoutError:
+            if outer_timeout_s is None:
+                return LLMResponse(
+                    content="Error calling LLM: stream stalled",
+                    finish_reason="error",
+                    error_kind="timeout",
+                )
             return LLMResponse(
-                content=f"Error calling LLM: timed out after {timeout_s:g}s",
+                content=f"Error calling LLM: timed out after {outer_timeout_s:g}s",
                 finish_reason="error",
                 error_kind="timeout",
             )