Brainstormed design for §22 slice M3 (registry mirror + routing + runtime
branding). Decomposes M3 into a §10.3 Tier-1 test/local-env foundation
(M3-0) plus four sequential feature sub-plans (M3a migration+restamp, M3b
registry mirror, M3c routing+redirects+branding, M3d landing-state/review).
Records resolved decisions: hard-cut branding, §4.1 reconciler pattern,
Stage-1 forward-only migration latitude with a future expand/contract note.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Ben Stull