Guard gear fit with headless and Blender regression checks

The Python fit test now caps the glasses at 0.70x head width and requires a
positive bag clearance on both the coat and dress. The Godot character suite
loads head/back gear on six roles and checks attach parents, head width and
brow bounds, and that back gear reaches beyond the 0.26 m body silhouette.
Rebuilt and re-baked all 18 gear assets; no-op GLB export churn was reverted.
Headless 229/229, Python 87/87.

src/test/tests/test_npc_character.gd

@@ -191,6 +191,68 @@ func test_library_gear_attaches_to_the_contract_points() -> bool:
 	responder.free()
 	return a and b and c and d
 
+## Horizontal bounds of a gear GLB in its attach-node space. The head/back
+## contract is measured against the Blender fit report (head width 0.315 m,
+## widest body silhouette 0.26 m); this catches a gear shrinking back inside
+## the body or a cap sinking below the brow.
+func _gear_bounds(node: Node3D) -> AABB:
+	var box := AABB()
+	var first := true
+	for child in node.find_children("*", "MeshInstance3D", true, false):
+		var mi := child as MeshInstance3D
+		var b: AABB = mi.get_aabb()
+		# Gear meshes have no extra transform below the attach node.
+		if first:
+			box = b
+			first = false
+		else:
+			box = box.merge(b)
+	return box
+
+func test_head_and_back_gear_clear_the_body_silhouette() -> bool:
+	const HEAD_WIDTH := 0.315
+	const WIDEST_BODY_RADIUS := 0.26
+	var problems: Array[String] = []
+	var seen := {}
+	for npc_type in [Rules.NpcType.TOURIST, Rules.NpcType.INFLUENCER,
+			Rules.NpcType.RESPONDER, Rules.NpcType.PERFORMER,
+			Rules.NpcType.DELIVERY, Rules.NpcType.TRESPASSER]:
+		var avatar := _avatar(npc_type, 5)
+		for child in avatar.find_children("Gear_*", "Node3D", true, false):
+			var gear := child as Node3D
+			var name := gear.name.trim_prefix("Gear_")
+			var attach := str(NpcAvatar.GEAR_ATTACH.get(name, ""))
+			if attach != "head" and attach != "back":
+				continue
+			seen[attach + ":" + name] = true
+			var box := _gear_bounds(gear)
+			if attach == "head":
+				var parent_name := gear.get_parent().name
+				if parent_name != "Head":
+					problems.append("%s is not under Head" % name)
+				if box.size.x > HEAD_WIDTH * 1.70:
+					problems.append("%s is %.3f m wide (head %.3f)" % [
+						name, box.size.x, HEAD_WIDTH])
+				# The hood wraps the neck; all other headgear must start on the skull.
+				if name != "hood" and box.position.y < 0.0:
+					problems.append("%s starts %.3f m below the head origin" % [
+						name, box.position.y])
+			else:
+				if gear.get_parent().name != "Rig":
+					problems.append("%s is not under Rig" % name)
+				var outer_x := maxf(absf(box.position.x), absf(box.end.x))
+				var outer_z := maxf(absf(box.position.z), absf(box.end.z))
+				if maxf(outer_x, outer_z) < WIDEST_BODY_RADIUS:
+					problems.append("%s only reaches %.3f m (body %.3f)" % [
+						name, maxf(outer_x, outer_z), WIDEST_BODY_RADIUS])
+		avatar.free()
+	for required in ["head:sunglasses", "head:firefighter_helmet", "head:cap",
+			"back:shoulder_bag", "back:backpack", "back:scba_tank"]:
+		if not seen.has(required):
+			problems.append("missing %s" % required)
+	return TestUtils.check(problems.is_empty(),
+		"head/back gear clears the body silhouette (%s)" % str(problems))
+
 func test_fixed_detail_materials_are_not_tinted() -> bool:
 	var avatar := _avatar(Rules.NpcType.RESPONDER, 3)
 	var mi := avatar.find_child("npc_base", true, false) as MeshInstance3D