docs(i18n): record batch-1 coverage + checker, list remaining areas

AGENTS.md

@@ -1638,10 +1638,20 @@ similar are internal endpoints/hook names, not credits — leave them.)
   drift silent otherwise.
 - **User-generated content is never translated** (spot / listing / DM / crew text
   is whatever the author wrote).
-- ⚠️ Coverage is **partial**: the framework + ~33 namespaces exist, but most files
-  are not yet wired to `t()`. Continue extracting area by area (Map/spots →
-  Marketplace/trades → Lab/crews → Settings/legal). Untranslated text falls back
-  to English, so it degrades gracefully.
+- **Safety net:** `scripts/check-i18n.mjs` (wired into `npm test` as part of the
+  chain) fails the build if any literal `t('…')` key is missing from `en` OR `es`,
+  or if `en`/`es` drift. Dynamic template keys (`t(\`ns.${x}\`)`) are NOT checked —
+  keep those few in sync by hand.
+- **Coverage (2026-10-01, batch 1 done):** ~1,680 new keys (2,297 total) and ~65
+  files wired — **Map (`mapUi`)**, **spots (`spotUi`)** incl. detail/create/edit/
+  chat, **Marketplace/trades/offers/escrow/shipping (`marketUi`)**, and **Lab/
+  `/become/*`/coaches/skaters (`labUi`)**. **Still to do (batch 2+):** Settings,
+  auth (LoginArea/dialogs), Onboarding, Events, Shops, Tours, Crews, DMs/group,
+  Stash, Newsletter, Community Stats, legal (About/FAQ/Privacy/License/Glossary),
+  Wallet/Mints, App Shop, Food, Bounties/leaderboards, Admin review. Untranslated
+  text falls back to English, so partial coverage degrades gracefully.
+- ⚠️ **When wiring a file, keep `en.ts`/`es.ts` key-for-key in sync** and run
+  `node scripts/check-i18n.mjs` before committing.
 
 ## Nostr Protocol Integration