docs: update build performance benchmarks (v2.4.0)

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Automated build benchmark update for v2.4.0 from workflow run #78.

[greptile-apps]

Greptile Summary

Updated build performance benchmarks for v2.4.0 reflecting corrected native addon performance after fixing the stale addon issue in #156.

Key improvements:

• Native build speed: 6.7 → 1.9 ms/file (~3.5x faster)
• 1-file rebuild: 374 → 89 ms (~4.2x faster)
• Native complexity phase: 588.4 → 4.6 ms (~127x faster)
• 50k files estimate: 335s → 95s build time

These metrics now accurately reflect the native complexity optimizations from recent PRs (#149, #140) that were previously masked by using a stale npm addon during benchmarking.

Confidence Score: 5/5

• This PR is safe to merge with no risk
• Automated documentation-only update from CI benchmarks. Changes are consistent across files and correctly reflect performance improvements after fixing the stale native addon issue in fix: benchmark uses stale native addon from npm #156.
• No files require special attention

Important Files Changed

Filename	Overview
README.md	Updated performance metrics reflecting significant native build improvements (6.7→1.9 ms/file, 374→89ms 1-file rebuild)
generated/BUILD-BENCHMARKS.md	Comprehensive benchmark data updated with corrected native performance after fixing stale addon issue (#156)

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