Replace battle maps 51 and 52 with hand-painted assets

docs/battle-map-terrain-atlas-pipeline.md

@@ -2,7 +2,7 @@
 
 ## Scope
 
-The first fifty campaign battles now use the same hand-painted tactical map pipeline. The renderer still reads the original scenario tile coordinates and battle logic; only the map texture asset changes from flat/vector map art to low-contrast raster terrain.
+The first fifty-two campaign battles now use the same hand-painted tactical map pipeline. The renderer still reads the original scenario tile coordinates and battle logic; only the map texture asset changes from flat/vector map art to low-contrast raster terrain.
 
 ## Art Direction
 
@@ -18,6 +18,7 @@ The first fifty campaign battles now use the same hand-painted tactical map pipe
 - Very large maps can use a 176px tile target through `VERY_LARGE_MAP_TILE_SIZE` when WebP encoding or browser memory pressure becomes the limiting factor.
 - Ultra large maps can use a 160px tile target through `ULTRA_LARGE_MAP_TILE_SIZE` when 176px output exceeds WebP encoder limits.
 - Extreme large maps can use a 152px tile target through `EXTREME_LARGE_MAP_TILE_SIZE` when 160px output exceeds WebP encoder limits.
+- Massive maps can use a 144px tile target through `MASSIVE_LARGE_MAP_TILE_SIZE` when 152px output approaches the WebP encoder edge.
 - Re-evaluate the tile target before a generated map's longest edge approaches roughly 16,384px at 192px per tile.
 - Use `--tile-size` only for controlled comparisons; commit the selected production size in the map config.
 
@@ -77,6 +78,8 @@ python scripts/generate-handpaint-map-sample.py --map forty-seventh --webp-quali
 python scripts/generate-handpaint-map-sample.py --map forty-eighth --webp-quality 90
 python scripts/generate-handpaint-map-sample.py --map forty-ninth --webp-quality 90
 python scripts/generate-handpaint-map-sample.py --map fiftieth --webp-quality 90
+python scripts/generate-handpaint-map-sample.py --map fifty-first --webp-quality 90
+python scripts/generate-handpaint-map-sample.py --map fifty-second --webp-quality 90
 ```
 
 Comparison example:
@@ -137,6 +140,8 @@ python scripts/generate-handpaint-map-sample.py --map thirtieth --tile-size 192
 - `src/assets/images/battle/forty-eighth-battle-map.webp`
 - `src/assets/images/battle/forty-ninth-battle-map.webp`
 - `src/assets/images/battle/fiftieth-battle-map.webp`
+- `src/assets/images/battle/fifty-first-battle-map.webp`
+- `src/assets/images/battle/fifty-second-battle-map.webp`
 
 ## QA Outputs
 
@@ -238,5 +243,9 @@ python scripts/generate-handpaint-map-sample.py --map thirtieth --tile-size 192
 - `docs/forty-ninth-battle-map-handpaint-preview.png`
 - `docs/fiftieth-battle-map-handpaint-before-after.png`
 - `docs/fiftieth-battle-map-handpaint-preview.png`
+- `docs/fifty-first-battle-map-handpaint-before-after.png`
+- `docs/fifty-first-battle-map-handpaint-preview.png`
+- `docs/fifty-second-battle-map-handpaint-before-after.png`
+- `docs/fifty-second-battle-map-handpaint-preview.png`
 
 Browser screenshots are saved per verification run after build/deploy.