#426 review M1. #426's stage_index.rs adds `pub const PIECE_KIND_NONE: u8 = 6`,
which cbindgen exports, but #426 left the committed header as main's. So the first
build of wai-rs rewrote include/wai.h, the tree was dirty, and every HTTP corpus
falsify-patch shard failed its first "the tree is clean after reversing the patch"
check. The header now holds the define, exactly the six lines the build writes.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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