M6.2: IDML import/export
New crate designcraft-idml (L3, zip + quick-xml): export_idml/import_idml for
swatches (process/spot CMYK/RGB/Lab, tints, gradients), paragraph/character/
object styles with BasedOn and groups, fonts, preferences, layers, sections,
parent spreads, spreads/pages (spine/centre origin mapping), frames, groups,
corner options, wrap, transparency, embedded/linked images, formatted stories
with special characters, breaks and threading. Engine commands
file.exportIdml / file.openIdml, file.open/openBytes dispatch on IDML, CLI
--in/--export .idml, File > Export IDML..., open dialogs accept .idml.
Verified black-box in InDesign 2026 (exported files open with correct pages,
stories, threads, styles, swatches; InDesign-exported IDML imports).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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