feat(properties): prepare property commands before execution

- Create missing note files before running property:set.
- Default date-only datetime values to midnight.
- Keep property names out of path authorization checks.
- Split policy, vault, daily note, and command target helpers.
- Split n8n node args, description, output, and API response helpers.
- Split API tests by auth, command, daily note, and property behavior.
- Bump API and n8n node versions.

app/runner.py

@@ -4,12 +4,20 @@ from pathlib import Path
 from starlette.responses import JSONResponse
 
 from app.config import CLI_BIN
+from app.property_commands import prepare_property_args
 
 def error(status_code:int, detail:str) -> JSONResponse:
   return JSONResponse({"detail": detail}, status_code=status_code)
 
 async def execute_command(args:list[str], cwd:Path, stdin:str|None, timeout:float) -> JSONResponse:
   command_id = str(uuid.uuid4())
+  try:
+    args = prepare_property_args(args, cwd)
+  except PermissionError as exc:
+    return error(403, str(exc))
+  except OSError as exc:
+    return error(500, f"failed to prepare property command: {exc}")
+
   command = [CLI_BIN, *args]
   started = time.perf_counter()