docs: update incremental benchmarks (2.5.1)

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Automated incremental benchmark update for 2.5.1 from workflow run #102.

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Greptile Summary

This PR updates the incremental benchmark documentation with fresh results after the benchmark script was fixed in PR #199. The updated benchmarks re-measure v2.5.1 performance with the improved script (which added timeout and removed redundant stdio options).

The changes update benchmark timings across all three data representations (main table, detailed sections, and JSON block) consistently. All formatting and data integrity checks pass.

Confidence Score: 5/5

• This PR is safe to merge with no risk - it's an automated documentation update
• Score is 5/5 because this is an automated benchmark documentation update with consistent, valid data across all formats. The changes are documentation-only, the data is internally consistent, and there are no code or logic changes that could introduce bugs
• No files require special attention

Important Files Changed

Filename	Overview
generated/INCREMENTAL-BENCHMARKS.md	Updated benchmark results for v2.5.1 after benchmark script fixes, showing consistent data across all formats

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