- Header banner: add 2026-04-19 entry for the release to backend-v4 /
frontend-v4 split repos; state upfront that this monorepo is the single
source of truth.
- §6 rewritten: layout diagram, remotes table, feature-branch → commit →
publish workflow, exact `git subtree split` commands used to fast-forward
frontend-v4/main and backend-v4/main, notes on what each split repo does
and does not contain, and the safety rules for files that must never be
committed (pgdata backups, build caches, env files).
Made-with: Cursor
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