feat(gameplay): large zoomable map, neighborhood layout, tagging fix

Major changes:
- Map: 80x40 (was 38x18) - requires zoom/pan to navigate
- CameraController: pinch-to-zoom, drag-to-pan, scroll wheel zoom
- Neighborhood layout: streets grid with house rows, backyards, fences
- All gaps minimum 2.5 units wide for unit passage
- Streets visible on ground (gray paths)

Bug fixes:
- Tagging: only captured unit goes to jail, never the instigator
- Collision handled once (by lower instance ID)
- Respawn offset fixed for landscape mode

New constants:
- CameraMinZoom/MaxZoom/StartZoom
- MinGapSize, StreetWidth
- VisionRadius increased to 6 (larger map)

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

Backyard CTF/Assets/Scripts/Unit.cs

@@ -137,25 +137,25 @@ public class Unit : MonoBehaviour
 
     void HandleTagCollision(Unit other)
     {
+        // Only process collision once - lower instance ID handles it
+        if (GetInstanceID() > other.GetInstanceID()) return;
+
         // Determine who gets tagged: farther from their own base loses
+        // The instigator (closer to their base) is NOT captured
         Transform myBase = Game.Instance.GetBase(team);
         Transform theirBase = Game.Instance.GetBase(other.team);
 
         float myDistance = Vector2.Distance(transform.position, myBase.position);
         float theirDistance = Vector2.Distance(other.transform.position, theirBase.position);
 
+        // Only the one farther from their base gets tagged
         if (myDistance > theirDistance)
         {
             TagOut();
         }
-        else if (theirDistance > myDistance)
-        {
-            other.TagOut();
-        }
         else
         {
-            // Equal distance - both get tagged (more chaos!)
-            TagOut();
+            // They are farther or equal - they get tagged
             other.TagOut();
         }
     }
@@ -193,9 +193,10 @@ public class Unit : MonoBehaviour
     {
         yield return new WaitForSeconds(Game.RespawnDelay);
 
-        // Respawn at base
+        // Respawn at base (landscape - horizontal offset toward center)
         Transform baseTransform = Game.Instance.GetBase(team);
-        Vector3 offset = new Vector3(Random.Range(-2f, 2f), team == Team.Player ? -2f : 2f, 0);
+        float xOffset = team == Team.Player ? 2f : -2f;
+        Vector3 offset = new Vector3(xOffset, Random.Range(-2f, 2f), 0);
         transform.position = baseTransform.position + offset;
 
         isTaggedOut = false;