Avoid Jupyter terminal job-control noise

src/jupyter_runtime.py

@@ -542,7 +542,7 @@ PY
         pid_file = shlex.quote(f'{run_dir}/{marker}.pid')
         env_prefix = self._remote_env_prefix()
         inner_command = f'{env_prefix}{command}'
-        wrapped = (
+        wrapper_script = (
             f'mkdir -p {workspace} {quoted_run_dir} && '
             f'cd {workspace} && '
             f'printf "\\n{start_marker}\\n"; '
@@ -561,6 +561,11 @@ PY
             f'rm -f {pid_file}; '
             f'printf "\\n{marker}:%s\\n" "$__zk_status"'
         )
+        # Run the wrapper inside a foreground non-interactive bash. Sending the
+        # whole background-job wrapper directly to the terminal shell can make
+        # the interactive shell print job-control lines such as
+        # "[1] + Done (setsid bash -lc ...)", which can hide the real stdout.
+        wrapped = f'bash -lc {shlex.quote(wrapper_script)}'
         with self._lock:
             name = self._ensure_terminal()
             ws_url = self._terminal_websocket_url(name)
@@ -1288,11 +1293,27 @@ def clean_terminal_output(text: str) -> str:
     lines = [
         line.rstrip('\r')
         for line in cleaned.splitlines()
-        if line.strip() not in {'#', '>'} and not re.fullmatch(r'(>\s*)+', line.strip())
+        if (
+            line.strip() not in {'#', '>'}
+            and not re.fullmatch(r'(>\s*)+', line.strip())
+            and not is_wrapper_job_control_line(line.strip())
+        )
     ]
     return '\n'.join(lines).strip('\r\n')
 
 
+def is_wrapper_job_control_line(line: str) -> bool:
+    """Return true for terminal job-control notices created by our wrapper."""
+    if 'setsid bash -lc' not in line:
+        return False
+    return bool(
+        re.match(
+            r'^\[\d+\]\s*[+-]?\s*(Done|done|Terminated|terminated|Killed|killed|Exit \d+)',
+            line,
+        )
+    )
+
+
 def extract_terminal_command_output(text: str, *, start_marker: str) -> str:
     """Drop terminal echo/prompt text before the wrapper's real start marker."""
     if not start_marker:

tests/test_jupyter_runtime.py

@@ -35,6 +35,14 @@ class TestJupyterRuntimeOutputFiltering(unittest.TestCase):
 
         self.assertEqual(output, 'actual')
 
+    def test_clean_terminal_output_drops_wrapper_job_control_line(self) -> None:
+        cleaned = clean_terminal_output(
+            'real-output\r\n'
+            '[1] + Done (setsid bash -lc "export A=1; lscpu")\r\n'
+        )
+
+        self.assertEqual(cleaned, 'real-output')
+
 
 if __name__ == '__main__':
     unittest.main()