This follows the Rust-side Tantivy removal by deleting the remaining
Python Tantivy runtime, tests, and packaging references.
It also turns the legacy Python-only Tantivy parameters into explicit
errors and stops reading legacy `_indices/fts` directories so Python FTS
is fully native-only.
## Summary
- Update dependencies across Rust, Python, Node.js, Java, Docker, and
docs
- Pin unpinned dependency lower bounds to prevent silent downgrades
- Bump CI actions to current major versions
🤖 Generated with [Claude Code](https://claude.com/claude-code)
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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>