Item 4 of the #351 remainder — implement value-fuzz for the media
dimension/family attributes previously parked in the flat property
suite's ATTR_VALUE_FUZZ_ALLOWLIST as "round-trip candidates deferred to
a later PR": width/height/align/aspectRatio/size/caption/title/alt across
image, video, youtube, pdf, drawio, excalidraw, embed.
Each gets a non-default-value arbitrary in attr-arbitraries.ts and is
removed from the allowlist; the P1 (semantic) + P2 (byte-stability)
property gate now exercises them. All round-trip green — the comment-JSON
serialization (stable key order, String()-stringified) carries every one
faithfully, so no new pins or accepted-limitations were needed.
embed.width/height are fuzzed as numeric STRINGS (not numbers): a
non-default embed dimension round-trips through the comment JSON as a
string (the numeric 800/600 default is still omitted/re-materialized),
so authoring a number diverged under P1.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
agent_coder
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