Choose paragraph layout rules from an optional language tag. Pass language
to horizontal and vertical shaping, add basic Chinese punctuation rules,
and add experimental Korean spaces-only wrapping.
Keep text boundaries grapheme-safe and preserve paragraph profiles across
editor splits and merges. Add reproducible font fixtures for localized
glyphs and regression tests for the shared WASM protocol and layout paths.
Validation: renderer, common JVM/JS, frontend and exporter tests pass.
Both WASM targets build. Full CI still reports baseline lint and format
errors and one backend multipart-upload test failure.
AI-assisted-by: GPT-6
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