Character and paragraph styles checked a new attribute against the keys its base style
serializes, and the JSON leaves out Auto leading and kerning, no mojikumi and other defaults.
So charStyle.new / setAttrs refused leading or kerning, paraStyle.new refused mojikumi, and a
style captured from text with explicit leading failed to apply to Auto-leading text, to
duplicate or to come back out of a library.
The check now also accepts every field name the style type deserializes (read from serde's
derive), still refusing unknown keys and the file-only justify_auto.
The test creates and edits styles with kerning, leading, small caps, mojikumi and direction,
applies a captured leading style to fresh text with and without Clear Overrides, duplicates it,
uses it from a library, and checks `nope` and `justify_auto` are still refused.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
# Conflicts:
# ROADMAP.md
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