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Garry TanandClaude Fable 5.1
b4d88a0126
renderDesignMd re-sorted canonical section names into spec order on every render, so `gstack-design-md mark legacy-keep` (the "leave it alone" answer) and the design binary's mockup extraction reordered a legacy DESIGN.md (Typography and Layout jumped to the top) and normalized its whitespace, while the bin promised "body bytes untouched". `mark` now splices only the marker line (insertMarker) and `updateDesignMd` splices only its own section (spliceSection); every other byte of an existing file is preserved, and spec order applies only to files that open with front matter. `mark` refuses a choice that contradicts the file's format (spec on a non-spec file, legacy-keep on a spec file) with DESIGN_MD_CONVERT_REFUSED, exit 2, file unchanged. convertLegacy keeps intro prose under the title instead of rebuilding the preamble from the title alone. detectFormat returns a machine-readable `code` beside the prose reason (the bin no longer branches on reason text); the marker regexes derive from FORMAT_MARKER_PREFIX and FORMAT_CHOICES; the hop limit and legacy identity headings are named constants; slug is exported and reused; both writers use lib/fs-atomic.ts. Tests pin byte identity for mark and updateDesignMd on the legacy fixture, the refusal paths, and the preserved preamble. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>