feat(tools): irregular strata and angular boulder blocks

Strata gain a dip, a slow seeded warp that bends and notches the beds, and
a per-bed thickness and hardness jitter with ordered boundaries, so walls
never invert. BoulderField gains an angularity parameter: elongated
super-ellipse slabs with flat tops, sharp shoulders, random heading and
tilt, footprint area preserved. Both sites are re-baked with the new
settings; the coral heads stay rounded.

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

tools/sites/terrain_showcase_recipe.gd

@@ -68,16 +68,17 @@ static func recipe() -> SiteTerrainBaker.Recipe:
 		SiteTerrainBaker.Outcrop.new(EAST_BUTTE_CENTRE, 38.0, 75.0, 9.0, 8.0, 202, 5.0, true),
 		SiteTerrainBaker.Canyon.new(PackedVector2Array(CREVASSE_PATH), CREVASSE_HALF_WIDTH_M, CREVASSE_DEPTH_M, 1.0, 203, 1.0, SonarMaterial.Value.SAND),
 
-		# SW — le Chaos: ninety boulders of 2-6 m radius plus six coral heads, on rippled sand.
-		SiteTerrainBaker.BoulderField.new(BOULDER_FIELD_CENTRE, BOULDER_FIELD_RADIUS_M, 301, 90, 2.0, 6.0, 0.7),
-		SiteTerrainBaker.BoulderField.new(Vector2(-100.0, 130.0), 40.0, 302, 6, 6.0, 9.0, 0.6),
+		# SW — le Chaos: ninety angular blocks of 2-6 m radius plus six rounded coral heads,
+		# on rippled sand.
+		SiteTerrainBaker.BoulderField.new(BOULDER_FIELD_CENTRE, BOULDER_FIELD_RADIUS_M, 301, 90, 2.0, 6.0, 0.7, 0.85),
+		SiteTerrainBaker.BoulderField.new(Vector2(-100.0, 130.0), 40.0, 302, 6, 6.0, 9.0, 0.6, 0.0),
 		SiteTerrainBaker.Ripples.new(Vector2(1.0, 0.3), 3.5, 0.3, BOULDER_FIELD_CENTRE, 110.0),
 
 		# SE — les Éperons: two pitted rock spurs 7-8 m high framing a 20 m sand channel
 		# littered with small blocks.
 		SiteTerrainBaker.Outcrop.new(WEST_SPUR_CENTRE, 30.0, 60.0, 8.0, 5.0, 401, 7.0, true),
 		SiteTerrainBaker.Outcrop.new(EAST_SPUR_CENTRE, 30.0, 55.0, 7.0, 5.0, 402, 7.0, true),
-		SiteTerrainBaker.BoulderField.new(CHANNEL_CENTRE, 50.0, 403, 12, 1.5, 3.0, 0.8),
+		SiteTerrainBaker.BoulderField.new(CHANNEL_CENTRE, 50.0, 403, 12, 1.5, 3.0, 0.8, 1.0),
 
 		# S — la Corniche: sinuous 22 m escarpment, then a 42 degree slope to the 80 m floor,
 		# with rounded knolls on the slope.
@@ -97,8 +98,13 @@ static func recipe() -> SiteTerrainBaker.Recipe:
 	result.modifiers = [
 		# Crumbly rock faces, smooth sand. Before the strata so the ledges stay flat.
 		SiteTerrainBaker.SlopeRoughness.new(2028, 0.12, 0.7, 20.0, 40.0),
-		# Strata on the north-west quarter only (mesa flanks and canyon walls): 4 m ledges.
-		SiteTerrainBaker.Strata.new(4.0, 0.85, 30.0, 50.0, Rect2(-256.0, -256.0, 256.0, 256.0)),
+		# Strata on the north-west quarter only (mesa flanks and canyon walls): beds of
+		# about 4 m, dipping 1.3 degrees to the south-east, bent by 2.4 m of slow warp,
+		# each bed with its own thickness and hardness.
+		SiteTerrainBaker.Strata.new(
+			4.0, 0.85, 30.0, 50.0, Rect2(-256.0, -256.0, 256.0, 256.0),
+			Vector2(0.015, 0.018), 105, 2.4, 0.5
+		),
 	]
 	return result