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>

Main.tscn

@@ -0,0 +1,11 @@
+[gd_scene format=3 uid="uid://d4nynm8e2xnyj"]
+
+[ext_resource type="Script" uid="uid://cvugyvd1fuj7l" path="res://scripts/GameManager.cs" id="1_gm"]
+[ext_resource type="Script" uid="uid://b822hloehyggd" path="res://scripts/Visualization.cs" id="2_viz"]
+
+[node name="Main" type="Node2D" unique_id=1549676286]
+script = ExtResource("1_gm")
+TicksPerRealSecond = 1500.0
+
+[node name="Visualization" type="Node2D" parent="." unique_id=1946930493]
+script = ExtResource("2_viz")