fix(content): lay the Vigilant hull along la Saignee within the distance budget

The target hull now lies along the groove axis (yaw derived from the
groove constants), set back 22 m from the groove end so both hull ends
rest on the flat groove floor. The mooring, spawn and first route
waypoints move to z = -210 and the decoy yacht to (-30, -150) so no
wreck is farther than 320 m from the mooring and no two wrecks are
farther than 260 m apart (spec 4.1). The spawn faces south toward the
site. Four contract assertions pin the budget, the spawn heading and
the hull orientation.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/contract/run_site_content_tests.gd

@@ -15,7 +15,11 @@ const DiveRulesResolver = preload("res://game/domain/rules/dive_rules_resolver.g
 const SITE_PATH := "res://content/sites/zone1_vigilant.tres"
 const ROUTE_CLEARANCE_M := 3.0
 const MINIMUM_LANDMARK_SPACING_M := 60.0
-const TEST_COUNT := 30
+const MAXIMUM_ANCHOR_TO_WRECK_M := 320.0
+const MAXIMUM_WRECK_SPACING_M := 260.0
+const HULL_HALF_LENGTH_M := 14.0
+const HULL_SEABED_TOLERANCE_M := 2.0
+const TEST_COUNT := 34
 
 var _failures: Array[String] = []
 
@@ -107,6 +111,26 @@ func _test_zone1_content() -> void:
 				spaced = false
 	_expect(spaced, "landmarks are at least 60 m apart")
 
+	var wrecks := targets + decoys
+	if anchors.size() == 1:
+		var anchor := anchors[0].position_m
+		var farthest := 0.0
+		for wreck: SitePlacement in wrecks:
+			farthest = maxf(farthest, _xz_distance(anchor, wreck.position_m))
+		_expect(farthest <= MAXIMUM_ANCHOR_TO_WRECK_M, "every wreck lies within 320 m of the mooring (farthest %.0f m)" % farthest)
+	var widest := 0.0
+	for i in wrecks.size():
+		for j in range(i + 1, wrecks.size()):
+			widest = maxf(widest, _xz_distance(wrecks[i].position_m, wrecks[j].position_m))
+	_expect(widest <= MAXIMUM_WRECK_SPACING_M, "every pair of wrecks lies within 260 m (widest %.0f m)" % widest)
+	if targets.size() == 1:
+		var target_xz := Vector2(targets[0].position_m.x, targets[0].position_m.z)
+		var spawn_xz := Vector2(spawn.x, spawn.z)
+		var yaw := definition.spawn_yaw_radians
+		var spawn_forward := Vector2(-sin(yaw), -cos(yaw))
+		_expect(spawn_forward.dot(target_xz - spawn_xz) > 0.0, "the spawn faces the target wreck")
+		_expect(_hull_lies_along_seabed(field, targets[0]), "the target hull lies along the groove floor")
+
 
 func _rests_on_terrain(field: TerrainHeightField, placement: SitePlacement) -> bool:
 	var seabed := field.elevation_at(placement.position_m.x, placement.position_m.z)
@@ -114,6 +138,17 @@ func _rests_on_terrain(field: TerrainHeightField, placement: SitePlacement) -> b
 	return bottom >= seabed - placement.footprint_m.y and bottom <= seabed + 1.0
 
 
+func _hull_lies_along_seabed(field: TerrainHeightField, hull: SitePlacement) -> bool:
+	var centre := Vector2(hull.position_m.x, hull.position_m.z)
+	var long_axis := Vector2(cos(hull.yaw_radians), -sin(hull.yaw_radians))
+	var centre_seabed := field.elevation_at(centre.x, centre.y)
+	for side: float in [-1.0, 1.0]:
+		var end := centre + long_axis * HULL_HALF_LENGTH_M * side
+		if absf(field.elevation_at(end.x, end.y) - centre_seabed) > HULL_SEABED_TOLERANCE_M:
+			return false
+	return true
+
+
 func _route_clears_terrain(field: TerrainHeightField, route: SiteRoute) -> bool:
 	for i in range(route.waypoints_m.size() - 1):
 		var a := route.waypoints_m[i]