[nfc] clang-tidy

[mikea]

No description provided.

[fhanau]

Let's see if we can build our own clang-tidy and use that: cloudflare/workerd-tools#9

[codspeed-hq]

CodSpeed Performance Report

Merging #5108 will not alter performance

_{Comparing maizatskyi/2025-09-16-clang-tidy (1bb6341) with main (eb2102c)}

Summary

✅ 33 untouched
⏩ 9 skipped¹

Footnotes

1. 9 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩