fix: normalize escaped Work artifacts

tests/test_agent_loop.py

@@ -7,7 +7,12 @@ from typing import Any
 
 from agent_platform.auth import UserIdentity
 from agent_platform.models import get_model_spec
-from agent_platform.runtime.loop import AgentLoop, tool_event_details
+from agent_platform.runtime.loop import (
+    AgentLoop,
+    is_substantive_execution,
+    normalize_write_file_content,
+    tool_event_details,
+)
 from agent_platform.runtime.tools import TOOL_METADATA
 from agent_platform.store import RuntimeStore
 
@@ -20,6 +25,26 @@ def tool_call(call_id: str, name: str, arguments: dict[str, Any]) -> dict[str, A
     }
 
 
+def test_write_file_normalizes_double_escaped_code_layout() -> None:
+    escaped = r'import time\n\n# benchmark\ndef main():\n\tprint("keep\ninside")\n\nmain()\n'
+    assert normalize_write_file_content("benchmark.py", escaped) == (
+        'import time\n\n# benchmark\ndef main():\n\tprint("keep\\ninside")\n\nmain()\n'
+    )
+
+
+def test_write_file_normalizes_double_escaped_plain_text() -> None:
+    assert normalize_write_file_content("report.md", r"# Report\n\nMeasured: 1.2 s\n") == (
+        "# Report\n\nMeasured: 1.2 s\n"
+    )
+
+
+def test_read_only_shell_commands_do_not_satisfy_execution_evidence() -> None:
+    assert not is_substantive_execution("exec", {"command": "cat report.txt"})
+    assert not is_substantive_execution("exec", {"command": "sed -n '1,20p' script.py"})
+    assert is_substantive_execution("exec", {"command": "python3 script.py"})
+    assert is_substantive_execution("start_process", {"command": "python3 server.py"})
+
+
 class ScriptedProvider:
     def __init__(self, responses: list[dict[str, Any]]) -> None:
         self.responses = responses