Rust rewrite baseline

[jayhack]

Summary

This merges the Rust rewrite baseline so future work can fan out from a faster, lower-memory compact backend. The Python API shell remains in place for now, but the branch adds the Rust/PyO3 indexing path, compact Python handles, CLI/uvx packaging work, docs/site scaffolding, large-repo proof tooling, and merge-readiness handoff docs.

Latest final-pass addition:

• Added compact TypeScript JSX element records in Rust.
• Exposed targeted PyO3 JSX lookups.
• Added read-only compact Python APIs for file.jsx_elements, symbol.jsx_elements, symbol.is_jsx, and nested JSX traversal.
• Added rust-rewrite/agent-handoff.md for future agents.

Validation

Local checks on 1e3da93d:

• uv run ruff check
• cargo fmt --check
• cargo test -p graph-sitter-engine --lib
• cargo test -p graph-sitter-py --lib
• uv run pytest tests/unit/sdk/codebase/test_rust_backend.py::test_rust_compact_typescript_jsx_elements_do_not_materialize_python_graph -q
• rust-rewrite/tools/check_fast.sh

Hosted checks on 1e3da93d:

• Rust Rewrite Fast Checks: passed
• Rust Rewrite Extension Builds: passed
• Rust Rewrite Large Repos: passed

Known Gaps

This is mergeable as the new development baseline, but not a full correctness claim yet. The main follow-up lanes are documented in rust-rewrite/agent-handoff.md and rust-rewrite/p0-parity-coverage.json:

• Full graph-wide semantic parity.
• Full TypeScript expression/type-system parity.
• JSX prop and mutation parity.
• Promise-chain async conversion parity.
• Default-backend/removal sequencing for the old Python backend.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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[jayhack]