South town MVP: world sim, seasons, granary, contrast test + findings

Godot 4.7 C# world simulation per SPEC.md (with 2026-07-21 amendments).
15 NPCs, 5-state machine, demand-driven work, soul-imprint triad data
model, seasons with winter frost, granary, need-based gift economy,
selfish-soul contrast wiring, daily/per-villager/gift CSV logging.

FINDINGS.md documents the four soak experiments: the dead paradise,
the buffers winning, the emergent hungry gap, and the contrast test
proving the four-town thesis (and that selfishness wins until the
soul-consequence layer exists).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

WorldSim.csproj

@@ -0,0 +1,8 @@
+<Project Sdk="Godot.NET.Sdk/4.7.1">
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <EnableDynamicLoading>true</EnableDynamicLoading>
+    <RootNamespace>WorldSim</RootNamespace>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+</Project>