Expansion phase: settlements — the North joins the world

Runs 5-6 logged in FINDINGS.md (soul layer validated: nature debris
0.000 vs selfish 0.225 after two years; the ledger works).

Towns are now real spatial structure: TownDef seeds (South at the
bottom of the map, North at the top), NPCs affiliate with a home town,
communal duty serves your own settlement (buildings are town-tagged,
founding uses the town centroid and per-town shelter caps), and each
town raises its own shelters and granary. Generational (North) soul
profile added — temperament only until the knowledge system lands.
Map shows town labels; rosters and CSVs carry town columns.

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

scripts/SoulProfile.cs

@@ -63,6 +63,22 @@ public class SoulProfile
         Accumulation   = 0.1f,
     };
 
+    /// <summary>
+    /// North-weighted profile: reverence for lineage, strong communal pull,
+    /// modest material appetite. Their signature system — generational
+    /// knowledge transfer (SPEC §5) — arrives with the expansion phase;
+    /// until then they differ from the South in temperament, not verbs.
+    /// </summary>
+    public static SoulProfile GenerationalSoul() => new()
+    {
+        Type           = SoulType.Generational,
+        Generosity     = 0.8f,
+        Sustainability = 0.8f,
+        CommunityBias  = 0.95f,
+        StatusBias     = 0.15f,
+        Accumulation   = 0.2f,
+    };
+
     /// <summary>
     /// East-weighted profile — not part of MVP behavior, but defined now for
     /// the end-of-MVP contrast test (SPEC §11 amendment): 3 selfish NPCs