docs: update build performance benchmarks (v2.4.0)

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Automated build benchmark update for v2.4.0 from workflow run #68.

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Greptile Summary

Automated benchmark update for v2.4.0, reflecting performance metrics after recent complexity analysis features were added.

• Updated build performance metrics showing expected regression (native: 2.1→4.8 ms/file, WASM: 6.4→7.4 ms/file) due to complexity metric extraction added in recent PRs
• Added incremental rebuild metrics (no-op: 3ms, 1-file: 263ms for native engine)
• Added granular query latency breakdowns for individual query types
• File count increased from 109 to 117 as codebase grew
• Benchmark data is consistent between README.md and generated/BUILD-BENCHMARKS.md

Confidence Score: 5/5

• This PR is safe to merge with no risk - it's an automated documentation update
• Score reflects that this is purely a documentation update from an automated workflow with no code changes, consistent data between files, and expected performance metrics that align with recent feature additions
• No files require special attention

Important Files Changed

Filename	Overview
README.md	Updated performance metrics table with latest v2.4.0 benchmarks, added incremental rebuild and query latency metrics
generated/BUILD-BENCHMARKS.md	Updated benchmark data for v2.4.0 including native engine metrics, showing expected performance changes from complexity feature additions

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