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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>