`lib/use-auth.js` is now the sole client-side auth surface (P1 §9 of
`.convoys/ship-readiness.md`). The legacy `lib/auth-context.js`
(`AuthProvider` + `useAuth`) and `lib/admin-auth.js` (`AdminProvider` +
`useAdmin` + `useIsAdmin`) are deleted; every importer is migrated to
the canonical hook. Pre-convoy a worst-case page mount issued THREE
identical `GET /api/auth/verify` requests (one per provider/hook); the
post-convoy floor is one verify per page mount (3 → 1 on
`pages/card/[id].js`, 2 → 1 elsewhere).
Importer inventory swept (7 source files):
- `pages/_app.js` — removed `<AuthProvider>` wrapper; `<ThemeProvider>`
is now the only top-level provider. `lib/use-auth.js` is hook-only,
no replacement provider needed.
- `pages/index.js`, `pages/scanner.js`, `pages/decks.js`,
`pages/deck/[id].js`, `pages/deck-builder.js` — `import { useAuth }`
path swap from `../lib/auth-context` to `../lib/use-auth`. All five
pages destructured only `{ user }` or `{ user, loading }`; verified
no consumer reads `login` / `register` from useAuth (those flows are
in `pages/login.js` / `pages/signup.js` which call the API directly),
so no shape-parity gap on `lib/use-auth.js`.
- `pages/card/[id].js` — replaced `useIsAdmin()` (the only consumer of
`lib/admin-auth.js` anywhere in the tree) with synchronous
`user?.role === 'admin'` derived from the existing `useAuth()` call.
Render condition at line 524 stays byte-identical.
Decisions documented in `.convoys/single-auth-provider.md`:
- D1: no extension to `lib/use-auth.js` (zero call sites for `login` /
`register` from useAuth — those flows are direct fetches in
`login.js` / `signup.js`).
- D2: `useIsAdmin()` collapses onto `useAuth()`; no separate hook.
- D3: provider tree `<ThemeProvider><AuthProvider>{children}</AuthProvider></ThemeProvider>`
→ `<ThemeProvider>{children}</ThemeProvider>`.
- D4: 3 → 1 verify roundtrip on `card/[id].js`; 2 → 1 on every other
page-load.
- D5: zero test files modified; the 21-test vitest suite is server-
side or prop-driven (`Layout.test.js` passes `user` as a prop, never
imports the legacy hooks).
Doc / config updates so the deletion lands cleanly:
- `.github/CODEOWNERS` — drop the two CODEOWNERS lines for the deleted
files.
- `AGENTS.md` § 2 architecture row + § 3 "Auth (client)" bullet —
rewritten for the post-convoy single-surface state.
- `.cursor/rules/auth-and-permissions.mdc` — § "Legacy" reframed to
"deleted by this convoy"; § "Authentication state on the client"
updated to the post-convoy `useAuth()` shape and the direct-fetch
login flow used by `login.js` / `signup.js`.
- `.cursor/rules/no-go-zones.mdc` — auth-refactors bullet drops the
deleted files from the canonical list.
- `.cursor/skills/add-page/SKILL.md` — checklist + anti-pattern row
refer to the deletion.
Verification:
- `rg "lib/auth-context|lib/admin-auth" --type js` → 0 hits in source.
- `npm run lint` → 128 → 125 problems (3 fewer errors from the deleted
unused-import lines; no regression).
- `npm run test:run` → 21/21 pass (including the 5 Layout regression
locks from `fix-layout-default-user`, which are prop-driven and
unaffected).
- `npm run build` → all 26 pages compile end-to-end; no SSR / static-
generation breakage that would have surfaced if a page tried to use
the legacy context hook unwrapped.
- Manual smoke deferred to operator post-merge per convoy doc.
Risks (full discussion in convoy file):
- R1 shape parity gap — verified zero consumers of legacy-only
surface; mitigated.
- R2 SSR mismatch from removing `<AuthProvider>` — `useEffect`-
guarded `localStorage` read; identical SSR shape pre/post; build
passes.
- R3 missed importer — post-delete grep + build pass would surface
any miss.
- R5 stale `useAuth` cache across components — pre-existing
pattern, called out as follow-up rather than addressed here.
Out of scope: any change to `lib/permission-middleware.js` (server-
side; resolved P0 #1), `lib/auth-secret.js` (resolved P0 #2),
`pages/api/**` route handlers, login / register API contracts, or
the seeded admin account flow.
Co-authored-by: Cursor <cursoragent@cursor.com>
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