Adds systems.db regeneration discipline (#855) via a `meta` table (#856)
stamped by every generator, a pre-push hook that rejects stale DBs (#857),
and the top-level `make regen-db` / `make check-systems-db` targets that
drive the whole pipeline.
The stamp stores SHA-1 of generator source + schema, so the pre-push hook
can cheaply detect "you changed a generator but forgot to regen the DB"
before a binary merge conflict lands. Sprint 36 hit that class of conflict
on two branches touching systems.db simultaneously — this is the systemic
fix.
Regenerated systems.db is stamped; `make check-systems-db` passes.
Refs: #855#856#857
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.6
8371e05e52