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/settlement_layouts/procedural_tier2.json

@@ -0,0 +1,14 @@
+{
+  "id": "procedural_tier2",
+  "kind": "procedural",
+  "tier": 2,
+  "category_weights": {
+    "inn": 0.10,
+    "shop": 0.30,
+    "house": 0.45,
+    "civic": 0.05,
+    "infrastructure": 0.10
+  },
+  "target_building_count": 12,
+  "plaza_radius_tiles": 22
+}