feat(snap-point): add SnapPoint node with pose, baby_only filter, and occupant tracking

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/objects/snap_point.gd

@@ -0,0 +1,42 @@
+## SnapPoint — attachment position on furniture where a Character can snap into a pose.
+## Add to any furniture node. The node auto-registers in the "snap_points" group on _ready.
+class_name SnapPoint extends Node2D
+
+signal character_snapped(character: Character)
+signal character_unsnapped(character: Character)
+
+@export var pose: String = "sitting"
+@export var baby_only: bool = false
+
+var occupant: Character = null
+
+
+func _ready() -> void:
+	add_to_group("snap_points")
+
+
+func is_free() -> bool:
+	return occupant == null
+
+
+func accepts(character: Character) -> bool:
+	if not is_free():
+		return false
+	if not baby_only:
+		return true
+	if character.data == null:
+		return false
+	return character.data.state == CharacterData.State.BABY
+
+
+func snap(character: Character) -> void:
+	occupant = character
+	character_snapped.emit(character)
+
+
+func unsnap() -> void:
+	if occupant == null:
+		return
+	var prev: Character = occupant
+	occupant = null
+	character_unsnapped.emit(prev)