fix: gate static actor interaction range by map

Author: MikelCalvo

internal/worldruntime/scopes.go

@@ -299,7 +299,7 @@ func (s Scopes) VisibleStaticActorByVIDWithinInteractionRange(subject loginticke
 }
 
 func StaticActorWithinInteractionRange(subject loginticket.Character, actor StaticEntity, maxDistance int32) bool {
-	if maxDistance <= 0 {
+	if maxDistance <= 0 || effectiveMapIndex(subject.MapIndex) != effectiveMapIndex(actor.Position.MapIndex) {
 		return false
 	}
 	dx := int64(subject.X) - int64(actor.Position.X)
@@ -309,6 +309,13 @@ func StaticActorWithinInteractionRange(subject loginticket.Character, actor Stat
 	return distanceSquared <= maxDistanceSquared
 }
 
+func effectiveMapIndex(mapIndex uint32) uint32 {
+	if mapIndex == 0 {
+		return bootstrapMapIndex
+	}
+	return mapIndex
+}
+
 func (s Scopes) VisibleTargetsForStaticActor(actor StaticEntity) []PlayerEntity {
 	return s.filterTargets(0, staticActorVisibilityCharacter(actor), s.Topology.SharesVisibleWorld)
 }

internal/worldruntime/scopes_test.go

@@ -253,6 +253,15 @@ func TestScopesVisibleStaticActorByVIDWithinInteractionRangeRequiresCurrentRange
 	}
 }
 
+func TestStaticActorWithinInteractionRangeRequiresSameEffectiveMap(t *testing.T) {
+	subject := entityRegistryCharacter("Subject", 0x02040101, 42, 1700, 2800)
+	actor := StaticEntity{Entity: Entity{ID: 10, Name: "NearbyOtherMap"}, Position: NewPosition(43, 1701, 2801), RaceNum: 20300}
+
+	if StaticActorWithinInteractionRange(subject, actor, 300) {
+		t.Fatal("expected nearby static actor on another map to stay outside interaction range")
+	}
+}
+
 func TestScopesCharacterVisibilitySnapshotsIncludeVisibleStaticActors(t *testing.T) {
 	topology := NewBootstrapTopology(1).WithRadiusVisibilityPolicy(400, 200)
 	registry := NewEntityRegistryWithTopology(topology)

spec/protocol/visibility-rebuild.md

@@ -69,6 +69,12 @@ This is the query now reused by:
 - self-facing AOI rebuild on `MOVE`
 - self-facing AOI rebuild on `SYNC_POSITION`
 
+Interaction-range helpers are deliberately stricter than plain distance math:
+- the actor must still share the subject's effective bootstrap map
+- then the helper applies the configured maximum squared-distance check
+
+This prevents a nearby coordinate on another effective map from passing a later interaction or combat range gate solely because its `x/y` values are close.
+
 ### Ground-item relocation visibility
 
 `internal/worldruntime/scopes.go` now owns relocation-preview math for runtime-owned ground-item occupancy supplied by the bootstrap shared-world runtime.