nip71: fix feed hang — surface published_at so ingest skips history fetch

Deep dive into the "nothing loads / Fetching recent videos… hangs" symptom
found the real blocker: it was NOT the moderation/WoT stage (that uses
cached reads and passes unknown authors through clean). It was the feed's
resolve-posted-at stage.

resolveVideoPostedAt() short-circuits when a video has nip71.publishedAt,
otherwise it does a per-video `nostrClient.hydrateVideoHistory()` network
fetch (looking up kind-30078 history). Foreign NIP-71 videos have no such
history, and the ingest adapter wasn't setting nip71.publishedAt — so a
burst of ~32 ingested videos triggered ~32 blocking history fetches that
stalled the render and flooded relays.

Fix: the ingest adapter now surfaces nip71.publishedAt from the NIP-71
published_at tag (falling back to created_at). The feed short-circuits and
never fetches history for ingested videos. Re-enables FEATURE_NIP71_INGEST
by default now that the hang is addressed.

Tests: adapter published_at extraction + created_at fallback;
mutation-verified. 1237/1238 unit (known UploadModal flake).

Co-Authored-By: Claude Opus 4.8 <[email protected]>

tests/nip71-ingest-adapter.test.mjs

@@ -56,6 +56,25 @@ test("maps a foreign NIP-71 event to a playable bitvid video", () => {
   assert.equal(v.isPrivate, false);
 });
 
+test("surfaces nip71.publishedAt so the feed skips per-video history fetches", () => {
+  // The published_at tag becomes nip71.publishedAt (feed resolve-posted-at uses
+  // it to avoid a blocking kind-30078 history fetch per ingested video).
+  const withPublished = buildVideoFromNip71Event(
+    foreignEvent({
+      tags: [
+        ["title", "Has published_at"],
+        ["published_at", "1700000123"],
+        ["imeta", "url https://example.com/v.mp4", "m video/mp4"],
+      ],
+    }),
+  );
+  assert.equal(withPublished.nip71.publishedAt, 1700000123);
+
+  // Falls back to created_at when there's no published_at tag.
+  const noPublished = buildVideoFromNip71Event(foreignEvent({ created_at: 1699999999 }));
+  assert.equal(noPublished.nip71.publishedAt, 1699999999);
+});
+
 test("content-warning maps to isNsfw so the NSFW gate applies", () => {
   const clean = buildVideoFromNip71Event(foreignEvent());
   assert.equal(clean.isNsfw, false);