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docs/architecture/c4-component-layers.md — the Level-3 layer dependency graph generated by `deptrac analyse --formatter=mermaidjs` (code-derived, drift-proof). Closes the A6 «C4 drift» gap at the component level. README diagram index + regenerate note updated. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>