docs: update incremental benchmarks (2.6.0)

[github-actions]

Automated incremental benchmark update for 2.6.0 from workflow run #128.

[greptile-apps]

Greptile Summary

Automated benchmark documentation update for version 2.6.0, adding new performance data to the incremental benchmarks table.

• Added benchmark results for 2.6.0 (146 files, up from 142)
• Updated latest results section from 2.5.1 to 2.6.0
• Native engine shows slight improvements in no-op rebuilds (-33%)
• WASM engine shows regression in 1-file rebuilds (+37%, from 368ms to 504ms)
• All percentage calculations and data formatting are accurate

Confidence Score: 5/5

• This PR is safe to merge - it's an automated documentation update with no code changes
• Documentation-only change with accurate benchmark data, consistent formatting, and correct percentage calculations
• No files require special attention

Important Files Changed

Filename	Overview
generated/benchmarks/INCREMENTAL-BENCHMARKS.md	Automated benchmark update for v2.6.0 with accurate data and calculations

_{Last reviewed commit: 5b965c7}

[greptile-apps]

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