fix: use correct hook field name last_assistant_message

The Claude Code Stop hook sends `last_assistant_message`, not
`assistant_message`. This was causing response_chars=0 on all
captured interactions. Also removes the temporary debug log block.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

deploy/hooks/capture_stop.py

@@ -59,8 +59,9 @@ def _capture() -> None:
         return
 
     hook_data = json.loads(raw)
+
     session_id = hook_data.get("session_id", "")
-    assistant_message = hook_data.get("assistant_message", "")
+    assistant_message = hook_data.get("last_assistant_message", "")
     transcript_path = hook_data.get("transcript_path", "")
     cwd = hook_data.get("cwd", "")
 

tests/test_capture_stop.py

@@ -158,7 +158,7 @@ class TestCapture:
             "cwd": "C:\\Users\\antoi\\ATOCore",
             "permission_mode": "default",
             "hook_event_name": "Stop",
-            "assistant_message": "Here is the answer to your question about the code.",
+            "last_assistant_message": "Here is the answer to your question about the code.",
             "turn_number": 3,
         }
         data.update(overrides)
@@ -215,7 +215,7 @@ class TestCapture:
         mock_urlopen.return_value = mock_resp
 
         with mock.patch("sys.stdin", StringIO(
-            self._hook_input(transcript_path=transcript, assistant_message=long_response)
+            self._hook_input(transcript_path=transcript, last_assistant_message=long_response)
         )):
             capture_stop._capture()