db:push regenerates the plugin schema barrel, so setup works on a clean machine

`officer_db/src/schema.ts` ends with an UNCONDITIONAL
`export * from './plugin-schemas.gen'`. That file is gitignored — it describes
this machine, not the project — and until now its only writer was
installPlugin.

So on a fresh clone the file does not exist and `bun db:push` dies with
MODULE_NOT_FOUND before creating a single table. That is exactly what
officer-setup.sh section 8 runs, so setup failed at the schema step on any
clean machine, and the only thing that would have written the file was
installing a plugin — which needs a working database. A deadlock, shipped with
the plugin system on 2026-08-15.

Reproduced by deleting the file and running push, not inferred.

`db:push` now runs scripts/gen-plugin-schemas.ts first. Wired into the script
rather than added as a setup step because setup is not the only caller:
pushSchema() shells out to the same command, a developer types it by hand, and
`git clean -xfd` removes the file at any time. A step someone has to remember
is one they forget once; push regenerating it means the barrel cannot be stale
when drizzle reads it.

Both paths verified: barrel deleted then push (regenerates, "No changes
detected"), and zero plugins on disk (writes a header-only barrel that
schema.ts still imports cleanly).

Also verified, on a scratch database, the premise the whole barrel design rests
on — that push drops what it cannot see. Full schema pushed, a row seeded into
music_favorites, then an empty barrel pushed: music_* and headscale_servers
were DROPPED along with the row. So "following the directory rather than the
install table" is load-bearing, not decorative.

Worth recording how close that came to being logged as the opposite. An earlier
run with an empty barrel reported "No changes detected", which read as evidence
that push does not drop. It was this fix working — the script had regenerated
the barrel before drizzle ran. The scratch database is what told them apart.

bunx tsgo clean. 797 tests, 787 pass, same 7 pre-existing failures. Scratch
database dropped; live plugin tables and rows verified intact.

package.json

@@ -19,7 +19,7 @@
     "build:dashboard": "bun run ./scripts/build/dashboard.ts",
     "build:landing": "bun run ./scripts/build/landing.ts",
     "db:gen": "cd src/databases/officer_db && bun run generate",
-    "db:push": "cd src/databases/officer_db && bun run push",
+    "db:push": "bun run scripts/gen-plugin-schemas.ts && cd src/databases/officer_db && bun run push",
     "db:migrate": "cd src/databases/officer_db && bun run migrate",
     "dev:emailer": "cd src/workspaces/emailer && bun run dev",
     "format": "{ git diff --name-only HEAD -- 'src/**/*.ts' 'src/**/*.tsx'; git ls-files --others --exclude-standard -- 'src/**/*.ts' 'src/**/*.tsx'; } | xargs -r prettier --write",