Initial commit: Theriapolis baseline at port/godot branch point

Captures the pre-Godot-port state of the codebase. This is the rollback
anchor for the Godot port (M0 of theriapolis-rpg-implementation-plan-godot-port.md).
All Phase 0 through Phase 6.5 work is included; Phase 7 is in flight.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Content/Data/building_templates/shop_general.json

@@ -0,0 +1,20 @@
+{
+  "id": "shop_general",
+  "name": "General Store",
+  "category": "shop",
+  "footprint_w_tiles": 6,
+  "footprint_h_tiles": 5,
+  "min_tier_eligible": 4,
+  "weight": 1.0,
+  "doors": [
+    { "x": 3, "y": 4, "facing": "S" }
+  ],
+  "decos": [
+    { "x": 4, "y": 1, "deco": "counter" },
+    { "x": 4, "y": 2, "deco": "counter" },
+    { "x": 1, "y": 1, "deco": "sign" }
+  ],
+  "roles": [
+    { "tag": "shopkeeper", "spawn_at": [4, 3] }
+  ]
+}