docs: update build performance benchmarks (3.9.1)

[github-actions]

Automated build benchmark update for 3.9.1 from workflow run #667.

[greptile-apps]

Greptile Summary

Automated benchmark update recording v3.9.1 performance data, generated by CI workflow run #667. The README performance table is restructured from a single "Latest" column to separate Native/WASM columns, and all figures are internally consistent with the raw JSON payload embedded in BUILD-BENCHMARKS.md.

Confidence Score: 5/5

Safe to merge — documentation-only automated benchmark update with no code changes.

All benchmark figures are internally consistent: per-file build rates (native 10.2 ms/file, WASM 13.7 ms/file) correctly derive from total build times over 570 files; resolution recall (71.1%) correctly aggregates JS (12/18) and TS (15/20) raw counts; 50k-file extrapolations are linear projections of per-file metrics; README summary values match the detailed benchmark tables exactly.

No files require special attention — both are generated documentation with no logic changes.

Important Files Changed

Filename	Overview
README.md	Updates benchmark summary table to v3.9.1; restructured from single Latest column to separate Native/WASM columns — all values match detailed benchmark data.
generated/benchmarks/BUILD-BENCHMARKS.md	Appends v3.9.1 rows to build, incremental, and query tables; updates raw totals, phase breakdown, and 50k-file extrapolations — all numbers internally consistent with embedded JSON.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[CI Workflow Run #667] --> B[Build codegraph v3.9.1\n570 files]
    B --> C{Engine}
    C --> D[Native Rust\n10.2 ms/file\n5.8s total]
    C --> E[WASM\n13.7 ms/file\n7.8s total]
    D --> F[Phase breakdown\nparse 3382ms · CFG 310ms\ndataflow 904ms]
    E --> G[Phase breakdown\nparse 3104ms · CFG 1077ms\ndataflow 835ms]
    F --> H[Resolution benchmark\nJS 12/18 · TS 15/20]
    G --> H
    H --> I[precision 100% · recall 71.1%]
    I --> J[Write BUILD-BENCHMARKS.md]
    J --> K[Update README.md summary]
    K --> L[Automated PR #880]

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