teknium1 141b12bd39 refactor: clean up type hints and docstrings in session_search_tool ...

Follow-up to PR #261 merge:
- Fix Optional[Any] → Union[int, float, str, None] (actually meaningful)
- Fix _resolve_to_parent return type to str (never returns None in practice)
- Trim verbose docstrings on internal helpers to single-line style
- Correct docstring that claimed 'unknown' on failure (returns str(ts))

2026-03-04 21:25:54 -08:00

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