docs: update build performance benchmarks

[github-actions]

Automated build benchmark update from workflow run #53.

[greptile-apps]

Greptile Summary

Automated benchmark update for version 2.4.0 with updated performance metrics.

Key changes:

• Updated README.md benchmark table with latest performance numbers
• Added v2.4.0 benchmark data to BUILD-BENCHMARKS.md (107 files, up from 99)
• Native build speed: 2.1 ms/file (11% regression from 1.9 ms/file)
• WASM build speed: 6.5 ms/file (slight improvement from 6.6 ms/file)

Issue found:

• The automated script (scripts/update-benchmark-report.js) has a bug that removes the "Lightweight Footprint" section from README.md when updating benchmarks. The regex replacement on line 220 captures and replaces the entire Performance section including subsections, but the replacement text doesn't preserve them. This should be fixed to prevent unintended content removal in future updates.

Confidence Score: 2/5

• This PR has a significant issue - it unintentionally removes documentation content
• While the benchmark data updates are correct, the automated script has a bug that removes the "Lightweight Footprint" section from the README. This is unintended content loss that should be addressed before merging. The script needs to be fixed to preserve subsections within the Performance section.
• README.md requires attention - the deleted "Lightweight Footprint" section should be restored

Important Files Changed

Filename	Overview
README.md	Updated build benchmarks, but automated script incorrectly removed the "Lightweight Footprint" section
generated/BUILD-BENCHMARKS.md	Added version 2.4.0 benchmark data with updated metrics (107 files, performance regression noted)

_{Last reviewed commit: 7f43722}

[greptile-apps]

_{2 files reviewed, 1 comment}

_{Edit Code Review Agent Settings | Greptile}

[greptile-apps]

The automated benchmark script removed the "Lightweight Footprint" section that existed here. This is a bug in scripts/update-benchmark-report.js - the regex on line 220 matches the entire Performance section including subsections, but the replacement text doesn't preserve them. The script should either:

1. Parse and preserve ### subsections within the Performance section
2. Or use a more precise regex to only replace the benchmark table itself

The comment in the script (lines 218-219) says subsections "are preserved" but they're actually being deleted.

[carlos-alm]

Closing: the benchmark updater regex had a bug that deleted the Lightweight Footprint README section. Fixed the regex and re-ran benchmarks on the latest code — both included in PR #117.