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/property_commands.py

@@ -0,0 +1,55 @@
+import re
+from pathlib import Path
+
+from app.command_target import extract_command_target, parse_kv_arg
+from app.vaults import vault_root_for_target
+
+DATE_ONLY_RE = re.compile(r"^\d{4}-\d{2}-\d{2}T?$")
+
+def arg_value(args:list[str], name:str) -> str|None:
+  for arg in args:
+    parsed = parse_kv_arg(arg)
+    if parsed and parsed[0] == name and parsed[1]:
+      return parsed[1]
+  return None
+
+def normalize_property_datetime_args(args:list[str]) -> list[str]:
+  target = extract_command_target(args)
+  if target.command != "property:set" or arg_value(args, "type") != "datetime":
+    return args
+
+  value = arg_value(args, "value")
+  if not value or not DATE_ONLY_RE.match(value):
+    return args
+
+  normalized_value = f"{value.rstrip('T')}T00:00:00"
+  return [f"value={normalized_value}" if parse_kv_arg(arg) == ("value", value) else arg for arg in args]
+
+def vault_note_path(vault_root:Path, path:str) -> Path:
+  note_path = (vault_root / path).resolve()
+  try:
+    note_path.relative_to(vault_root.resolve())
+  except ValueError as exc:
+    raise PermissionError(f"path escapes vault: {path}") from exc
+  return note_path
+
+def create_missing_property_file(args:list[str], cwd:Path) -> None:
+  target = extract_command_target(args)
+  if target.command != "property:set":
+    return
+
+  path = arg_value(args, "path")
+  if not path:
+    return
+
+  note_path = vault_note_path(vault_root_for_target(target, cwd), path)
+  if note_path.exists():
+    return
+
+  note_path.parent.mkdir(parents=True, exist_ok=True)
+  note_path.write_text("", encoding="utf-8")
+
+def prepare_property_args(args:list[str], cwd:Path) -> list[str]:
+  args = normalize_property_datetime_args(args)
+  create_missing_property_file(args, cwd)
+  return args