Pete news code-review fixes: realm-first ordering, parked-row reap, death-emit gate

- emitZoneClearNews: claim realm-first before the name guard so an unnamed
  straggler's first clear seeds news_realm_firsts (else the next named
  clearer is mis-announced as first-ever). Mirrors backfillZoneFirsts.
- RunMaintenance: reap permanently-parked pete_emit_queue rows (unsent,
  >30d) so a durable Pete outage can't accrete rows forever.
- emitDeathNews: gate on Enabled()/newsEmissionOn() before the char DB
  reads; markAdventureDead fires per-member on party wipes + in the sim.

internal/plugin/dnd_combat.go

@@ -583,6 +583,11 @@ func markAdventureDead(userID id.UserID, source, location string) {
 // unless the seam is enabled. Uses the character name (never the Matrix handle);
 // skips silently if the name is unknown.
 func emitDeathNews(userID id.UserID, location string) {
+	// Gate before the char lookups: markAdventureDead fires per-member on a
+	// party wipe and in the sim harness, so skip the DB reads when disabled.
+	if !peteclient.Enabled() || !newsEmissionOn() {
+		return
+	}
 	name := charName(userID)
 	if name == "" {
 		return