ci: pin pandoc to 3.10 for reproducible reference builds - #2
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Distro apt pandoc (3.1.3 on Ubuntu noble) converts the WCAG HTML to cosmetically different Markdown than the 3.10 used to author the committed reference, producing a false drift warning (100 insertions / 100 deletions, validate still passing). Install a sha256-pinned pandoc 3.10 static binary in CI so regeneration is byte-reproducible and the drift check fires only on real spec changes. Document the required version in build-reference.sh and AGENTS.
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Problem
The
build-referencejob emitted a drift warning on the post-merge main run. Root cause is toolchain drift, not a WCAG spec change: CI installed distro apt pandoc 3.1.3 (Ubuntu noble), while the committed reference was authored with pandoc 3.10. The two versions produce cosmetically different Markdown from identical HTML (symmetric 100 insertions / 100 deletions).validate.mjsstill passed, confirming structure and counts are unchanged.Fix
scripts/build-reference.shandAGENTS.md.Verified locally
validate.mjsOK (A=31 AA=24 AAA=31 total=86); regen with pandoc 3.10 leaves the reference byte-identical (empty diff); markdownlint clean. sha256e0f8af62d0f267d22baa5bcefe6d5dda3a097ccc60de794b759fe03159923244confirmed stable across two fetches.