release: bump version to 0.47.0

docs/technical/en/earth-layer-style-reference.md

@@ -182,11 +182,14 @@ The land/ocean base is an Earth base-map asset and preloads at startup; the "Bor
 | Vessel renderOrder | local `VESSEL_RENDER_ORDER` | `4.4` | Normal marker and interactive overlay |
 | Vessel track renderOrder | `VESSEL_RENDER_ORDER - 0.1` | `4.3` | Below vessel markers |
 | Vessel point pixel size | local `VESSEL_POINT_SIZE` | `34` | Shared size for normal markers and hover / locked overlays |
+| Default vessel render cap | `VESSEL_CONFIG.maxRenderedMarkers` | `0` | `0` means the frontend does not clip by default; positive values send `limit` and clip markers |
 | Vessel texture canvas size | local `VESSEL_ATLAS_CELL_SIZE` | `128` | Canvas point texture |
 | Course bucket count | local `VESSEL_COURSE_BINS` | `32` | Moving vessels are bucketed by COG to reduce draw calls while preserving direction |
 | Vessel hover picking throttle | local `VESSEL_HOVER_PICK_INTERVAL_MS` | `100` | `main.js` hover picking |
 | Vessel screen hit radius | local `VESSEL_POINTER_RADIUS_PX` | `22` | `main.js` screen-space picking |
 
+AIS vessel markers use batched `THREE.Points`, not one `THREE.Sprite` per vessel. Moving vessels stay triangular, anchored or slow vessels stay circular, and hover / locked states add a same-size glow overlay. Vessel type color and info-card type text must come from the same normalized result: `vessels.js` reads both backend `vessel_type_name` and AIS numeric `vessel_type`, derives the color-driving `type`, then exposes `vessel_type_display` for the info card, hover summary, and search results.
+
 ## Compute Centers
 
 | Name | Variable | Current Value | Location / Notes |