tessera-codegraph 0.8.0

A local, deterministic semantic code graph and MCP server for AI coding agents. 11 languages, personalized PageRank impact, hallucination validator, call-path tracing, graph export, incremental indexing.
Documentation 
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## Summary

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## Test plan

- [ ] `cargo fmt --check`
- [ ] `cargo clippy --all-targets --all-features -- -D warnings`
- [ ] `cargo test --all-targets --all-features`

## Notes

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