Per-component README pages under docs/components/<group>/, grouped by
responsibility (12 groups). Each page carries 구조 + flow mermaid +
key-decision rationale consolidated from HOTFIXES + spec. Index page
hosts group-wiring diagram; ARCHITECTURE crate graph migrates from
ASCII to mermaid.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
