docs(admin): fold admin-origin CORS into phase 3a Task 1

docs/superpowers/plans/2026-06-17-phase-3a-admin-panel.md

@@ -60,16 +60,23 @@ apps/admin/                             NEW workspace (mirror apps/worker)
 
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-### Task 1: Backend — `role` on `/api/me`
+### Task 1: Backend — `role` on `/api/me` + allow the admin origin (CORS)
 
 **Files:**
 - Modify: `packages/shared/src/index.ts` (PublicUser)
 - Modify: `apps/api/src/routes/me.ts`
-- Test: `apps/api/test/me.test.ts` (extend; or `apps/api/src/routes/me.test.ts` — match
-  where existing route tests live)
+- Modify: `apps/api/src/env.ts` (default `WEB_ORIGINS`), `apps/api/.env.example` (comment +
+  default `CORS_ORIGINS`)
+- Test: `apps/api/test/me.test.ts` (extend), `apps/api/test/cors.test.ts` (extend)
 
 **Interfaces:**
 - Produces: `PublicUser` now has `role: Role`; `MeResponse.user.role` is `'worker' | 'admin'`.
+  The default CORS/trustedOrigins list includes the admin dev origin `http://localhost:5174`.
+
+**Why CORS:** the admin app runs on dev port 5174 and calls the API on :3000 cross-origin.
+`env.WEB_ORIGINS` (used for both `hono/cors` and better-auth `trustedOrigins`) currently
+defaults to only `http://localhost:5173`, so without this the admin app's sign-in and every
+request are blocked in the browser.
 
 - [ ] **Step 1: Write/extend the failing test.** Using the test helpers
   (`apps/api/test/helpers.ts`: `createTestUser`, `authToken`/`bearer`), assert that
@@ -92,10 +99,16 @@ export const PublicUser = z.object({
 - [ ] **Step 4: Return `role` from the route.** In `apps/api/src/routes/me.ts`, add to the
   `user` body: `role: ((session.user as { role?: string | null }).role ?? 'worker') as Role`
   (import `Role`/`MeResponse` type from `@solelog/shared`). Keep the `MeResponse` typing.
-- [ ] **Step 5: Run tests — pass.** Also run `yarn workspace @solelog/api typecheck`.
-- [ ] **Step 6: Confirm worker app unaffected** — `yarn workspace @solelog/worker test`
+- [ ] **Step 5: CORS — allow the admin origin.** Add `http://localhost:5174` to the
+  default `WEB_ORIGINS` array in `apps/api/src/env.ts`
+  (`['http://localhost:5173', 'http://localhost:5174']`) and to the `CORS_ORIGINS=` line +
+  comment in `apps/api/.env.example`. Extend `apps/api/test/cors.test.ts` with a case
+  asserting the preflight allows `http://localhost:5174` (parametrize or add a second
+  origin assertion). Run the cors test — green.
+- [ ] **Step 6: Run tests — pass.** Also run `yarn workspace @solelog/api typecheck`.
+- [ ] **Step 7: Confirm worker app unaffected** — `yarn workspace @solelog/worker test`
   still green (it ignores the extra field).
-- [ ] **Step 7: Commit** — `feat(api): include role in /api/me response`.
+- [ ] **Step 8: Commit** — `feat(api): include role in /api/me + allow admin origin in CORS`.
 
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