feat(sites): strata on the Banc du Vigilant drop-off and multi-scale seabed relief

Strata now take a world rectangle, so the 4 m ledges cover the whole break
and talus south of z = 118 m without touching la Saignée or the landmarks.
Roughness gains octave and fractal-type parameters; a SlopeRoughness
modifier roughens rock faces only. Both sites are re-baked with hummocks
from 250 m down to 5 m. The secondary item, the first debris piece and one
safe-route waypoint move a few metres to keep their contracts.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

tools/sites/zone1_vigilant_recipe.gd

@@ -15,6 +15,9 @@ const GROOVE_END := Vector2(-10.0, 120.0)
 const RIDGE_START := Vector2(70.0, -150.0)
 const RIDGE_END := Vector2(80.0, 90.0)
 const BREAK_Z := 125.0
+# Strata apply from here south: past the groove's end cap (120 m) and still 3 m before
+# the break's smoothstep has dropped half a metre.
+const STRATA_START_Z := 118.0
 # The target's centre sits this far up the groove from GROOVE_END, so its 28 m hull
 # stops one groove half-width short of the end cap and rests on the flat groove floor.
 const TARGET_SET_BACK_M := 22.0
@@ -57,8 +60,22 @@ static func recipe() -> SiteTerrainBaker.Recipe:
 		SiteTerrainBaker.Blob.new(Vector2(25.0, 198.0), 6.3, 6.3, 2.0),
 		# Les Rides: sand ripples near the vessel only.
 		SiteTerrainBaker.Ripples.new(Vector2(1.0, 0.35), 9.0, 0.45, Vector2(0.0, -220.0), 90.0),
-		# Deterministic roughness everywhere.
+		# Deterministic roughness everywhere: the original 50 m texture, plus hummocks
+		# and swales from 250 m down to 15 m (five octaves) so the plateau is never flat.
 		SiteTerrainBaker.Roughness.new(1933, 0.02, 0.6),
+		SiteTerrainBaker.Roughness.new(1934, 0.004, 2.2, 5),
+		SiteTerrainBaker.Roughness.new(1936, 0.012, 1.2, 4),
+		# Hummocks of 20 m down to 5 m, the scale the pilot sees through the fog.
+		SiteTerrainBaker.Roughness.new(1937, 0.05, 0.6, 3),
+	]
+	result.modifiers = [
+		# La rupture et le tombant are a carbonate drop-off: 4 m strata on the break
+		# (full effect) and fainter ledges on the 35 degree talus below. The band starts
+		# south of the target hull and of la Saignée's end cap, so neither changes.
+		# Crumbly rock on every slope steeper than the sand rule, smooth sand elsewhere.
+		# Before the strata so the ledges stay flat.
+		SiteTerrainBaker.SlopeRoughness.new(1935, 0.12, 0.7, 20.0, 40.0),
+		SiteTerrainBaker.Strata.new(4.0, 0.85, 25.0, 40.0, Rect2(-384.0, STRATA_START_Z, 768.0, 384.0 - STRATA_START_Z)),
 	]
 	result.material_patches = [
 		SiteTerrainBaker.MaterialPatch.new(Vector2(140.0, 40.0), 28.0, SonarMaterial.Value.ROCK),
@@ -90,9 +107,9 @@ static func definition(terrain: SiteTerrainData) -> DiveSiteDefinition:
 		_on_seabed(field, &"decoy_coaster", SitePlacement.Kind.WRECK_DECOY,
 			Vector2(140.0, 40.0), -0.6, Vector3(26.0, 6.0, 8.0), 1.2),
 		_on_seabed(field, &"secondary_item", SitePlacement.Kind.SECONDARY_ITEM,
-			Vector2(-6.0, 157.0), 0.0, Vector3(1.0, 1.0, 1.0), 0.0),
+			Vector2(-6.0, 160.0), 0.0, Vector3(1.0, 1.0, 1.0), 0.0),
 		_on_seabed(field, &"debris_1", SitePlacement.Kind.DEBRIS,
-			Vector2(-12.0, 134.0), 0.4, Vector3(3.0, 2.0, 2.0), 0.3),
+			Vector2(-12.0, 136.0), 0.4, Vector3(3.0, 2.0, 2.0), 0.3),
 		_on_seabed(field, &"debris_2", SitePlacement.Kind.DEBRIS,
 			Vector2(-10.0, 139.0), 1.2, Vector3(6.0, 2.5, 2.5), 0.4),
 		_on_seabed(field, &"debris_3", SitePlacement.Kind.DEBRIS,
@@ -110,7 +127,7 @@ static func definition(terrain: SiteTerrainData) -> DiveSiteDefinition:
 		_route(&"safe_ridge", 32.0, [
 			Vector3(0.0, -14.0, -210.0), Vector3(70.0, -16.0, -200.0), Vector3(76.0, -16.0, -100.0),
 			Vector3(78.0, -16.0, 0.0), Vector3(76.0, -18.0, 80.0), Vector3(40.0, -24.0, 105.0),
-			Vector3(0.0, -26.0, 100.0), Vector3(-14.0, -30.0, 98.0),
+			Vector3(0.0, -24.0, 100.0), Vector3(-14.0, -30.0, 98.0),
 		]),
 		_route(&"risky_groove", 48.0, [
 			Vector3(0.0, -14.0, -210.0), Vector3(-60.0, -20.0, -150.0), Vector3(-50.0, -31.0, -100.0),