docs: update build performance benchmarks (v2.4.0)

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Automated build benchmark update for v2.4.0 from workflow run #71.

[greptile-apps]

Greptile Summary

Updated build performance benchmarks to v2.4.0 with measurements from CI workflow run #71.

Key changes:

• File count increased from 109 to 122 files (+13)
• Added new metrics: no-op rebuild time, 1-file rebuild time, and individual query latencies (fn-deps, path)
• All benchmark data is consistent between README.md and generated/BUILD-BENCHMARKS.md
• Native engine data now included in incremental rebuild and query latency tables

Performance trends observed:

• Native build speed: 2.1 → 6.1 ms/file (↑221%)
• WASM build speed: 6.4 → 8.7 ms/file (↑32%)
• Query times increased by 33-60% across different query types
• Estimated 50k file build time increased from ~105s to ~305s for native

The significant performance regression warrants investigation in a separate issue, but this PR accurately reflects the automated CI measurements.

Confidence Score: 5/5

• This PR is safe to merge - it's an automated documentation update with accurate data
• Documentation-only PR from automated CI workflow that accurately reflects benchmark measurements; no code changes, no logic to review, data is internally consistent
• No files require special attention - both files contain automated benchmark updates

Important Files Changed

Filename	Overview
README.md	Updated build performance benchmarks to reflect v2.4.0 measurements with additional query metrics
generated/BUILD-BENCHMARKS.md	Updated comprehensive benchmark data with v2.4.0 metrics, showing increased file count and detailed query latencies

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