Poetry: vermilion marks (section point, closing stop, 標韻 rhyme aid, kaeriten)

[HanpuLi]

Vermilion as a point, never a field: at most one or two per view.

• Nav: the current section ends in a vermilion point. Home: Hanpu Li ends in a vermilion full stop (same gesture as the Poetry Voucher title).
• Poems: each classical original ends in one vermilion full stop.
• 標韻 (off by default, remembered locally): vermilion 着重號 on prescribed rhyme slots (right of a vertical character, below a horizontal one). Data in content/poetry/rhymes.json, each mark stores its character and the original's SHA-256, so editing a poem fails the build until its rhymes are reviewed again. Uncertain slots (渡江雲「短」; 山坡羊「面」「真」「了」) are left unmarked with notes.
• poetry-flow.js now keeps inline marks when an oversized stanza is split between authored lines (verified at 320 px).
• Kunten: 返り点 in the site vermilion, light/dark/forced-colours.
• Font subsets gain only 韵; rhyme review notes are excluded from the glyph scan.

QA: dependency-free checks and all 29 npm run qa steps pass (author-shop timed out once in the full chain, passed on rerun; the remaining steps were then run individually).

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