docs: update build performance benchmarks (v2.4.0)

[github-actions]

Automated build benchmark update for v2.4.0 from workflow run #72.

[greptile-apps]

Greptile Summary

Updated build performance benchmarks from automated CI run for v2.4.0

• Benchmark date: 2026-02-27 (workflow run fix: resolve all dogfood v2.2.0 bugs #72)
• File count increased from 109 to 122 files analyzed
• All metrics (build times, query latencies, DB size) updated consistently across both README and detailed benchmark tables
• Added new incremental rebuild metrics for native engine
• Percentage change calculations are accurate relative to v2.3.0 baseline

Confidence Score: 5/5

• This PR is safe to merge - automated documentation update with no code changes
• Documentation-only change from automated CI workflow. All benchmark metrics are mathematically consistent across files, percentage calculations are correct, and data formatting follows existing patterns. No functional changes or risks.
• No files require special attention

Important Files Changed

Filename	Overview
README.md	Updated performance metrics summary table with v2.4.0 benchmarks - all values are mathematically consistent
generated/BUILD-BENCHMARKS.md	Updated detailed benchmark tables and JSON data with latest CI run results - percentage calculations and metrics are accurate

_{Last reviewed commit: 8ae760b}

[greptile-apps]

_{2 files reviewed, no comments}

_{Edit Code Review Agent Settings | Greptile}