Every image now serializes as ``; non-default layout/identity attrs
that markdown cannot express ride along in an attached `<!--img {…}-->` comment
on the same line, replacing the prior "image-with-attrs -> raw <img>" split for
the top-level path:
 <!--img {"width":"420","align":"left","attachmentId":"…"}-->
Keys (emitted only when non-default, stable order): width, height, align, size,
aspectRatio, attachmentId, caption, title. Numeric sizing attrs are stringified
in the payload (the import side reads DOM attributes back as strings), so a
numeric `width:420` round-trips byte-stably instead of churning `420 -> "420"`.
attachedCommentFor defuses any `--` in a value (e.g. a caption containing the
comment-closing `-->`) so the payload can never close the comment early.
Align default unified to "center" (#293 canon #4): editor-ext declares
image.align default "center" while this package's schema declared null — keeping
null would make the clean `` form dead code (every editor image is
"center"). Now the schema default is "center" (docmost-schema image align, with
explicit parseHTML/renderHTML), canonicalize KNOWN_DEFAULTS drops align=="center"
for image, and the serializer omits align when it is null OR "center". A null
align collapses to "center" on re-import (a null align is not a distinct editor
state) — stable, no ping-pong. Only left/right emit a comment.
Import: applyCommentDirectives gains an `img` handler that targets the comment's
previousElementSibling <img> and writes each decoded key to the DOM attribute
the schema reads (align, width, height, data-size, data-aspect-ratio,
data-attachment-id, data-caption, title), then removes the comment. Attached
only: a standalone `<!--img-->` with no adjacent image is inert. Fail-open on
malformed JSON / unknown keys.
Raw-HTML path unchanged in spirit: images inside columns/cells keep the
`<img …>` form (comments are dropped by the DOM parse stage); imageToHtml now
omits a redundant align="center" to match the unified default.
Tests: new image-comment.test.ts (21 cases incl. caption == `-->`, numeric-size
byte-stability, image-in-column <img> form, fail-open). Goldens updated
deliberately: markdown-roundtrip-spoiler-caption (captioned image -> comment
form), markdown-converter-gaps spec 14/15 (title now round-trips via comment;
column image drops redundant align), canonicalize-extra (center+null dropped,
left kept).
package vitest: 498 passed | 1 expected-fail; tsc clean. git-sync (rebuilt
build): 268 passed.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
claude code agent 227
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