Run the title catch-up in its own YouTube lane

CURRENT.md

@@ -40,6 +40,14 @@ mobile draft at 390px.
   - [x] C11 preview caching: Discord-hosted image/GIF previews (WebP 320px, hash-addressed, 5 MiB
     cap, one attempt) run after every walk in both modes. Live run `...-20260916090722`:
     `previewed: 2`; thumbs served over `/api/media/<scrape>/<item>/thumb` (200).
+  - [x] C53 Title catch-up as its own lane. Titles no longer share the preview batch: a dedicated
+    `TitleLane` walks every scrape with a pending title, 100 rows per batch with a 10 s pause
+    (hard-coded; it is a one-time catch-up and future titles arrive with the scrape), and takes no
+    media-traffic lock because it only calls YouTube's oEmbed. New `titleBatch` on the engine,
+    per-scrape `titlePending/titled/titleFailed` counters, `/api/media/titles` + start/pause
+    routes, and a Bot-tab card with progress, throughput, ETA, and Start/Pause. The lane
+    auto-starts on boot; with nothing pending it exits immediately. Preview backfill goes back to
+    previews only. Unit tests for `titleBatch` and a lane catch-up run; smoke covers the card.
   - [x] C52 Wildcard title search. `*` now maps to a LIKE wildcard in both title modes: a leading
     `*` drops the word anchor (`*car` finds *scar* and *discard*), in-token stars match between
     letters (`c*r*`), and a trailing star matches the plain prefix. `%` and `_` are escaped with an