Scholomance: replace kg's Cata 4-floor map with classic single-room layout

kg only ships the post-Cataclysm Scholomance (4 floors split as you ascend the school) but Ascension uses the classic single-floor layout where every wing branches off the central rooms.

Fix: new dungeon_replacements section in ascension_overrides.json. When a tile_key is listed there, build_data skips kg entirely for that dungeon and synthesises a single-floor entry from a manually-supplied map (Atlas-addon Scholomance.blp upscaled to 2048x2048) and AtlasLoot's per-dungeon boss list.

Coords come from AtlasLoot's 0..100 percent space scaled to the new map's pixel space directly. Pin classification: dungeonskull → boss (cls=3), None+name-contains-Rare → rare elite (cls=5), other interactives → cls=2.

data/ascension_overrides.json

@@ -1,5 +1,18 @@
 {
   "_comment": "Ascension-specific corrections to the upstream kg / AtlasLoot data. Each entry overrides where an enemy/extra is rendered. Match by tile_key + name (case-insensitive substring). pos is in kg pixel space (z=4 stitched image, 6144x4096). kg_floor_id picks the floor (omit if the dungeon is single-floor).",
+
+  "_dungeon_replacements_comment": "When the kg map is the wrong layout for Ascension (e.g. retail/Cata layout vs classic), replace the entire dungeon's map with one we author manually. Coords are in the new map's pixel space (0..width, 0..height). Bosses come from AtlasLoot's per-dungeon entries with cords; pinType=dungeonskull → cls=3, pinType=None → cls=5 (rare).",
+  "dungeon_replacements": {
+    "scholomance": {
+      "image": "maps/scholomance.webp",
+      "width": 2048,
+      "height": 2048,
+      "atlasloot_id": "Scholomance",
+      "label": "Scholomance",
+      "note": "kg ships only the Cata 4-floor layout; Ascension uses the classic single-room layout. Map is Atlas-addon BLP upscaled to 2048."
+    }
+  },
+
   "overrides": [
     {
       "tile_key": "stratholme",