Migrate vagrant-skeleton to atlas-uv consumers

Asset-aliases now reference the three baked subterrain atlas-sets
(subterrain_player, subterrain_tiles, subterrain_world) rather than
the legacy indexed pack labels. The rig asset_pack updates to
subterrain_player and each bone gains a calibrated anchor offset.
Furniture-draw loads the subterrain_world atlas once and renders
via source-rect draw_sprite_transform. The map tilemap field updates
to subterrain_tiles to match the new atlas-id. Dep-bumps for
lib-core.maps 0.3.0, lib-core.puppet 0.5.0, and
lib-asset.prototype-subterrain 0.2.0. Replace r_lib.draw_map with
draw_map_pre/post_entities.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

maps/vagrant_test.map.json

@@ -1,6 +1,6 @@
 {
     "id": "vagrant_test",
-    "tilemap": "vagrant_test",
+    "tilemap": "subterrain_tiles",
     "size": { "w": 20, "h": 20 },
     "tiles": [
         4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,