fix(seed): emit the users array the backend seeder reads

The fixture generator was a version behind the seeder, and the gap was
the `users` key.

`internal/seeder` unmarshals `seed.json` into `{demoUser, users,
entities}` and writes every account in `users`, falling back to
`demoUser` alone when the key is absent. `fixtureFrom` never emitted it —
its comment still claimed the Go loader "ignores the rest", which stopped
being true when the seeder gained the field. So `npm run seed:check`
reported stale on every run, and that is the seventh suite failure, the
one that pre-dates the TypeScript migration.

What made this worth investigating rather than regenerating: the
committed fixture was NOT wrong. It carries two accounts — the demo
administrator and `employer@krow.app` — and running `npm run seed:fixture`
against the old generator would have written a fixture without them.
`krow-backend/docs/deploy-9d3192a.md` says so in as many words, and tells
anyone deploying not to run it.

The accounts are not deleted from a live database by that — the only
DELETE in the seeder is the shift-record prune, and `upsertUser`'s ON
CONFLICT deliberately leaves `password_hash` alone. The damage lands on
the next fresh environment, where `user_employer` would simply never be
created, leaving nobody to sign in as to reach the employer console —
which is the exact gap `seeder.go` records the account as having been
added to close.

The matching frontend half already existed, unmerged, on
`feat/krow-employee-pages` (7a4b61d). That branch is a 53-file console
restructure that renames the same files this migration renamed, so it is
not mergeable here. Only the three files that carry the contract are
taken: `EMPLOYER_USER`, `seedData.User` naming both accounts, and the
generator emitting `users`.

The proof is that nothing had to be written. With the generator corrected
its output is byte-identical to the fixture already committed in
krow-backend — 168,293 bytes, `cmp` clean — so `seed.json` was never
opened for writing, and its md5 and mtime are untouched.

  typecheck     0 errors
  seed:check    "seed.json is in step with src/api/seed.js", exit 0
  npm test      1685/1691, up from 1684 — the fixture check now reads
                "24 applications, byte-identical". The remaining 6 are
                exactly the documented dca1842 baseline failures.
  lint          exit 0, 0 errors, 289 warnings
  build         exit 0, bundle 74d17e2d… unchanged

The bundle being unchanged is itself a check: `demoUser.ts` IS in the
production bundle, and `EMPLOYER_USER` is a new export of it. Nothing in
the app imports it, so it is tree-shaken out and not one byte reaches the
shipped code.

No baseline artifact touched. krow-backend not modified.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HBG1wnuRfJKCstGB8Fekr8

src/api/demoUser.ts

@@ -39,3 +39,29 @@ export const DEMO_USER: User = {
     emailDigest: true,
   },
 };
+
+/**
+ * The employer account, and the reason there is a second one at all.
+ *
+ * `policy.go` has always had three roles — admin, employer, talent — and the
+ * fixture had one administrator, so two thirds of the authorization table was
+ * never exercised and there was nobody to sign in as to reach the employer
+ * console. This account is what makes that path reachable.
+ *
+ * Unlike `DEMO_USER` this is not a default shape for the first render: nothing
+ * in the running app reads it. It exists so that `seedData.User` names both
+ * accounts, which is what the backend seeder writes. See `seed.ts`.
+ */
+export const EMPLOYER_USER: User = {
+  id: 'user_employer',
+  full_name: 'Jordan Blake',
+  email: 'employer@krow.app',
+  role: 'employer',
+  account_type: 'employer',
+  created_date: '2026-06-01T09:00:00.000Z',
+  preferences: {
+    owliverDefault: true,
+    compactDensity: false,
+    emailDigest: true,
+  },
+};

src/api/seed.ts

@@ -9,7 +9,7 @@
  */
 
 import { SHIFT_RECORDS } from './attendanceSeed';
-import { DEMO_USER } from './demoUser';
+import { DEMO_USER, EMPLOYER_USER } from './demoUser';
 
 const iso = (date: string) => new Date(`${date}T09:00:00.000Z`).toISOString();
 
@@ -1990,8 +1990,12 @@ const USER_ACTIVITY = ACTIVITY_EVENTS.map(([event_type, user_email, user_name, a
  * candidate, interview and shift record below — into the production bundle.
  * The fixtures here are for the test scripts, and they still read
  * `seedData.User` and `DEMO_USER` from this module, so both keep working.
+ *
+ * `EMPLOYER_USER` travels the same way. It is seeded, never rendered: the
+ * backend writes both accounts so the employer console has somebody to sign
+ * in as, and nothing in the running app imports it.
  */
-export { DEMO_USER } from './demoUser';
+export { DEMO_USER, EMPLOYER_USER } from './demoUser';
 
 /* ── Assignments ───────────────────────────────────────────────────────────
    Who is on which position, and until when — the record that turns a hire into
@@ -2051,5 +2055,5 @@ export const seedData = {
   Assignment: ASSIGNMENTS,
   ShiftRecord: SHIFT_RECORDS,
   Evidence: EVIDENCE,
-  User: [DEMO_USER],
+  User: [DEMO_USER, EMPLOYER_USER],
 };