roles are a table, seeded, with nothing depending on it yet

Phase 0 of moving roles out of a TypeScript union. The four the code names become
rows, marked isSystem because each is referenced by name somewhere:
rolePermitsDevTools tests for 'Developer', bootstrap writes 'Super Admin',
users.role defaults to 'Member', and 'Admin' is what rolePermitsDevTools
deliberately excludes. Renaming or deleting one of those is a code change, so the
flag is there for a future delete path to refuse on rather than for the failure to
surface later as an account that cannot log in.

DELIBERATELY NO FOREIGN KEY on users.role. That change cannot go through db:push:
push creates the table empty and adds the constraint in the same run, so every
existing account violates it. Verified against a scratch database — push reported
the violation, created the table, skipped the constraint, and exited 0. The FK is
a separate release, once every host holds these rows.

So this phase is additive and cannot fail, which is what makes it safe to hand to
an unattended rollout across five hosts. Nothing reads the table yet; USER_ROLES
is still the type and authorize.ts is untouched.

The seed runs from postdb:push, so a host gets the rows on its next schema push
with no extra step in a deploy plan. It never overwrites: a description edited on
one server must not be reverted by the next deploy.

Verified here the way the deploy doc now requires — by query, not by exit code.
Four rows present, seed idempotent on a second run, and a second push is a no-op,
which is the proof that the schema and the database agree.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

package.json

@@ -30,7 +30,7 @@
     "build:dashboard": "bun run ./scripts/build/dashboard.ts",
     "db:gen": "cd src/databases/officer_db && bun run generate",
     "db:push": "bun run scripts/gen-plugin-schemas.ts && cd src/databases/officer_db && bun run push",
-    "postdb:push": "bun run --env-file=.env scripts/backfill-session-models.ts",
+    "postdb:push": "bun run --env-file=.env scripts/backfill-session-models.ts && bun run --env-file=.env scripts/seed-roles.ts",
     "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",