Filter Jupyter terminal wrapper output

tests/test_jupyter_runtime.py

@@ -0,0 +1,40 @@
+from __future__ import annotations
+
+import unittest
+
+from src.jupyter_runtime import (
+    clean_terminal_output,
+    extract_terminal_command_output,
+)
+
+
+class TestJupyterRuntimeOutputFiltering(unittest.TestCase):
+    def test_extract_terminal_command_output_drops_wrapper_echo(self) -> None:
+        start_marker = '__ZK_AGENT_START_test__'
+        raw = (
+            'root@host:/workspace# mkdir -p /workspace && cd /workspace && '
+            'printf "\\n__ZK_AGENT_START_test__\\n"; '
+            '( setsid bash -lc \'export A=1; echo real-output\' ) &\r\n'
+            f'{start_marker}\r\n'
+            'real-output\r\n'
+        )
+
+        output = extract_terminal_command_output(
+            clean_terminal_output(raw),
+            start_marker=start_marker,
+        )
+
+        self.assertEqual(output, 'real-output')
+
+    def test_extract_terminal_command_output_uses_last_marker(self) -> None:
+        start_marker = '__ZK_AGENT_START_test__'
+        output = extract_terminal_command_output(
+            f'echo text containing {start_marker}\n{start_marker}\nactual',
+            start_marker=start_marker,
+        )
+
+        self.assertEqual(output, 'actual')
+
+
+if __name__ == '__main__':
+    unittest.main()