Apply @bureaudouble/typographe through native TextPart's rehype extension,
preserving Markdown structure, sanitization, code, links and stored messages.
Correct persona-owned controls, metric typography, palette and shared shell
geometry. Retain native message scrolling with measured composer spacing,
restore status collapse behavior, and fix hydration, image completion and
validated-output failure handling. Preserve the published About content.
Document package ownership, the seven-file persona rail, actual source size,
and the distinction between behavioral checks and visual baseline approval.
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