docs(agents): record the offline write queue wiring

AGENTS.md

@@ -763,6 +763,25 @@ session with **no other memory of this project**. So:
     returns). The relay probe still gates the **"nothing at all" card**
     (`relayUnreachable = !online || relay.status === 'offline'`), and both retries
     now call `refetchSpots()` **and** `relay.recheck()`.
+  - **Offline WRITE queue is now real (2026-09-29).** `lib/offlineCache` already
+    had a `pendingPosts` table + `useSyncPendingPosts`/`useQueuePost` + an
+    `OfflineIndicator` badge, but **nothing ever called `queuePost`** — offline
+    writes just threw. Now: **`useNostrPublish` queues on `isOffline()` (skipping
+    the 15s publish timeout) or when every relay fails**, storing the
+    **already-SIGNED event** (`queueSignedEvent`) so an interactive signer is
+    **never re-prompted at sync time**; `useSyncPendingPosts` publishes it
+    directly (`nostr.event`), **not** through `useNostrPublish` (which would
+    re-queue and duplicate), re-signing only legacy unsigned entries. Rules:
+    **supersede** — a new replaceable (0/3/10000+) or addressable (30000+) event
+    drops the older queued one; **TTL** — ephemeral kinds (`2259` spot status,
+    `24899` spot chat) are pruned after 15 min (late "I'm here" is worse than
+    none); **cap** 100; `getPendingPosts` returns `pending` **and** retryable
+    `failed` (a single failure must not strand an action) and the count includes
+    both; a **module-level `globalSyncing` lock** keeps ONE publisher even though
+    `OfflineIndicator` (which owns the sync) is mounted twice; retries every 30s
+    while offline→online. ⚠️ `useNostrPublish` now **resolves** (instead of
+    throwing) when it queues — callers show their success toast, corrected by a
+    global "Saved offline" toast + the badge.
   - **Offline map tiles (done 2026-09-28):** `lib/tileCache.ts` (Dexie
     `SkateSpotsTilesDB`, bounded: ≤3000 tiles, ≤500 KB each, oldest-used pruned)
     + `lib/cachedTileLayer.ts` (an `L.TileLayer` subclass that reads through it),