Soul layer: imprints, warmth echoes, and consequences

Ports the Unity POC soul systems into the sim:
- Warmth echoes: villagers remember who fed them (+0.15) and who turned
  them away (-0.25). Ask-for-food targeting runs on memory, not
  omniscience; the remembered-cold are not asked. Echoes fade daily.
- Refusing the hungry while holding food marks the refuser (others-regard
  debris) and is logged; empty-handed is not refusal.
- Harvesting below the 50% commons line marks the taker per unit taken.
- Soul-to-soul atmospheric pressure (SoulFieldSystem port): encased souls
  darken nearby atmospheres, clear souls lighten them.
- Debris costs biologically: nourishment drains faster and meals restore
  less as the soul encases.
- Instrumentation: avg_debris + refusals in daily stats; per-villager
  nourish/health/debris; refusals in the contact log; map dots dim with
  encasement.

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

scripts/Visualization.cs

@@ -97,7 +97,8 @@ public partial class Visualization : Node2D
             // Selfish souls get a dark red ring — same dot, different halo.
             if (npc.Soul.Type == SoulType.Selfish)
                 DrawCircle(p, 5.5f, new Color(0.75f, 0.15f, 0.15f));
-            DrawCircle(p, 3.5f, StateColor(npc.State));
+            // Debris dims the dot — encasement made visible.
+            DrawCircle(p, 3.5f, StateColor(npc.State).Darkened(npc.Imprint.Total * 0.7f));
             DrawString(font, p + new Vector2(5f, -4f), $"{i + 1}",
                 fontSize: 11, modulate: TextMain);
         }
@@ -121,13 +122,14 @@ public partial class Visualization : Node2D
 
             if (npc.Soul.Type == SoulType.Selfish)
                 DrawCircle(new Vector2(PanelX + 24, y - 5f), 6f, new Color(0.75f, 0.15f, 0.15f));
-            DrawCircle(new Vector2(PanelX + 24, y - 5f), 4.5f, StateColor(npc.State));
+            DrawCircle(new Vector2(PanelX + 24, y - 5f), 4.5f,
+                StateColor(npc.State).Darkened(npc.Imprint.Total * 0.7f));
             DrawString(font, new Vector2(PanelX + 36, y),
                 $"{i + 1,2}  {npc.State,-11}  {npc.Activity}",
                 fontSize: 13, modulate: TextMain);
-            DrawString(font, new Vector2(PanelX + 420, y),
-                $"F {npc.Fatigue,3:0}  N {npc.Nourishment * 100,3:0}  C {npc.TotalCarried(),4:0.0}" +
-                $"  mostly {npc.DominantStateToday().ToString().ToLower()[..4]}",
+            DrawString(font, new Vector2(PanelX + 400, y),
+                $"F {npc.Fatigue,3:0}  N {npc.Nourishment * 100,3:0}  D {npc.Imprint.Total * 100,2:0}" +
+                $"  C {npc.TotalCarried(),4:0.0}  {npc.DominantStateToday().ToString().ToLower()[..4]}",
                 fontSize: 12, modulate: TextDim);
         }