Stryker survivors of the first scoped run: the fixmap boundary code and the truncated
header return. All commits build.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Each case is a two-slot document whose chain puts the payload at the limit (accepted)
or one past (refused), so a scalar or container header read at the wrong width flips
one of the two. Also pins the message, truncated payloads and the first-value rule.
All commits build.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>