docs: update build performance benchmarks (3.9.6)

[github-actions]

Automated build benchmark update for 3.9.6 from workflow run #786.

[greptile-apps]

Greptile Summary

This is an automated CI-generated documentation update adding v3.9.6 build performance benchmarks to both README.md and generated/benchmarks/BUILD-BENCHMARKS.md. The new data reflects significantly higher build times across both native and WASM engines compared to v3.9.4.

Notable regressions in the reported data (not introduced by this PR, but surfaced by it):

• WASM no-op rebuild jumped 538% (21 ms → 134 ms) and WASM parse phase more than doubled (4484 ms → 11596 ms)
• Native build speed regressed ~81% (3.2 → 5.8 ms/file), pushing the 50k-file estimate from 160s to 290s
• Haskell resolution dropped from 100%/33.3% precision/recall to 0%/0%, indicating a complete resolution regression for that language

Confidence Score: 5/5

Safe to merge — purely auto-generated documentation with no code changes and internally consistent data

Both files are fully auto-generated by CI; the updated numbers are internally consistent between the JSON data block, the detail tables, the summary tables, and the README. No code logic is modified. The regressions visible in the data (WASM parse time, Haskell resolution) are measurement results that should be investigated in the codebase, not documentation issues.

No files require special attention for merge safety, though the WASM no-op rebuild regression (+538%) and Haskell resolution drop to 0%/0% in the underlying codebase deserve follow-up investigation outside this PR.

Important Files Changed

Filename	Overview
README.md	Updates benchmark summary table and per-language resolution table from v3.9.4 to v3.9.6; values are consistent with the detailed data in BUILD-BENCHMARKS.md
generated/benchmarks/BUILD-BENCHMARKS.md	Adds v3.9.6 rows to all historical tables (build, incremental, query), updates the latest snapshot section, and appends full JSON benchmark data; data is internally consistent but shows substantial build-speed regressions in WASM

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[CI Workflow Run #786\nv3.9.6 Release] --> B[Run Build Benchmarks\nNative & WASM engines]
    B --> C[Run Resolution Benchmarks\nper language]
    C --> D[Generate JSON Data\nBENCHMARK_DATA block]
    D --> E[Update BUILD-BENCHMARKS.md\nAppend v3.9.6 rows]
    D --> F[Update README.md\nSummary table + resolution table]
    E --> G[PR #1033 opened\nby github-actions bot]
    F --> G

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