Unbound exploration: let towns genuinely migrate

Reverts the home-range bound on exploration and the homestead anchor-clamp.
A town that must range far to eat now relocates for real - the South
drifting inland after a hard winter, an East scout wandering across the
map and homesteading where they land (some homes now 648 units from the
anchor). Kept the identity-hash explore direction (no southward bias) and
the centroid-relative communal cohesion clamp (that follows migration, it
doesn't fight it). Towns still hold distinct cultures and stable
populations - migration is emergent, not collapse.

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

scripts/NPC.cs

@@ -101,24 +101,13 @@ public class Npc
         Vector2 fromHome = Position - anchor;
         float distHome = fromHome.Length();
 
-        // Stay in the home range. A person forages OUT from their village and
+        // Venture outward, unbounded — a town that must range far to eat
-        // back, they don't march to the horizon — so past a search radius they
+        // genuinely relocates over time (the South drifting inland after a
-        // turn homeward. This keeps a strip-happy town (the East) from slowly
+        // hard winter, an East scout wandering into a neighbor). Direction is
-        // migrating into its neighbors instead of settling its own ground.
+        // outward from home, or — when right at the anchor — a per-soul angle
-        const float SearchRadius = 140f;
+        // from identity (NOT a fixed vector; the old default leaned hard +Y,
+        // i.e. south, which funnelled every town's explorers into one corner).
         Vector2 dir;
-        if (distHome > SearchRadius)
-        {
-            dir = (-fromHome).Normalized();                 // head back toward home
-            dir = dir.Rotated(PersonalityModifier * 0.6f);  // slight veer, still homeward
-        }
-        else
-        {
-            // Outward from home in a per-soul direction. When right at the
-            // anchor there's no outward vector, so pick an angle from the
-            // soul's identity — NOT a fixed vector (the old default leaned
-            // hard +Y, i.e. south, quietly funnelling every town's explorers
-            // into the southern corner).
         if (distHome > 1f)
             dir = fromHome.Normalized();
         else
@@ -126,8 +115,7 @@ public class Npc
             float ang = (Name.GetHashCode() & 0xFFFF) / 65535f * Mathf.Tau;
             dir = new Vector2(Mathf.Cos(ang), Mathf.Sin(ang));
         }
-            dir = dir.Rotated(PersonalityModifier * 1.4f + 0.6f);   // circle the home range
+        dir = dir.Rotated(PersonalityModifier * 1.2f);   // personality veer, so explorers fan out
-        }
         Position += dir * MoveSpeed;
         SenseNodes(gm.World);
     }
@@ -745,14 +733,11 @@ public class Npc
                 Enter(NpcState.Gathering);   // no stone yet — go get it
                 return;
             }
-            // Homestead on your OWN town's land — selfish souls sprawl (a
+            // Homestead where you actually live — no snapping back to the
-            // wide range, no clustering to the shared center) but they build
+            // town anchor. If a people have migrated (following food inland
-            // in the east if they're an East soul, not wherever they drifted
+            // after a hard winter), their homes rise where they now are; the
-            // into a neighbor's territory.
+            // town genuinely moves.
-            Vector2 anchor = gm.TownAnchor(HomeTown);
             Vector2 spot = _hasHomeSpot ? _homeSpot : Position;
-            Vector2 off = spot - anchor;
-            if (off.Length() > 120f) spot = anchor + off.Normalized() * 120f;
             mine = Building.NewShelter(spot);
             mine.Town = HomeTown;
             gm.Buildings.Add(mine);