Port 25, DMARC routes, restore Resync vs reload, image pin, and roadmap
index were stale relative to the running panel and Postfix config.
Co-authored-by: Cursor <cursoragent@cursor.com>
Centralises migration history, 1.x rules, and the 2.x squash gate so
roadmap and architecture no longer carry a stale v5 snapshot.
Co-authored-by: Cursor <cursoragent@cursor.com>