python-ripgrep 0.0.9 does not support Python 3.13 (requires <3.13,>=3.10).
This change replaces the python-ripgrep library with direct subprocess calls
to system ripgrep (rg) with fallback to grep.
Changes:
- Remove python-ripgrep import from local.py
- Rewrite search_files() to use shutil.which() to detect rg/grep availability
- Support ripgrep first, fallback to grep if not available
- Handle proper exit codes (0=success, 1=no matches for grep)
- Remove python-ripgrep from requirements.txt and pyproject.toml
Fixes#7496
4d00309d70