Wolves with a den, fishing, and a mixed diet

Wolves
- Den: a boulder cave at the foot of the rim, sited from the seed (away
  from the sea and spawn, mouth toward the valley, clearing in front)
- Grace period: no wolves days 1-2; they move in on day 3 and howl; hunting
  from night 4; pack of 2, 3 from day 6, 4 from day 9; replaced by day
- Wary pack hunters: circle and dart in one at a time; a lit campfire is a
  safe zone, a torch makes them hesitate, walls block bites (line of
  sight); hit one and the pack turns; hurt wolves flee; a lone wolf is
  timid; by day they defend the den; home at dawn
- Glowing eyes, synthesised howls, can't sleep with wolves prowling
- Wolf pelt and Wolf Cloak (+25 warmth)
- Animals take a committed detour around obstacles

Fishing
- Fishing rod (workbench); cast a float onto the lake, 1.5 s to land a bite
- Perch and rarer trout; faster bites at dawn/dusk and in rain; grill them
- Visible fish near the shore that jump with splash rings

Mixed diet
- Foods belong to meat, fish or greens; each level runs down over ~1.5 days
- One group low: no healing; two low: Malnourished (health drains);
  all three good: Balanced diet (heal x1.5); HUD diet bars; saved

Tests: test_wolves and test_fishing_diet; run_all.sh covers 9 suites

scripts/creatures/creature_meshes.gd

@@ -17,6 +17,7 @@ static func build(kind: String) -> Dictionary:
 	match kind:
 		"rabbit": d = _rabbit()
 		"deer": d = _deer()
+		"wolf": d = _wolf()
 		_: d = _boar()
 	_cache[kind] = d
 	return d
@@ -96,3 +97,29 @@ static func _boar() -> Dictionary:
 	return {"body": P._commit(st), "leg": _leg(0.36, 0.07, 0.05, bristle, Color(0.15, 0.12, 0.1), 222),
 		"hips": [Vector3(-0.17, 0.38, -0.36), Vector3(0.17, 0.38, -0.36), Vector3(-0.17, 0.4, 0.38), Vector3(0.17, 0.4, 0.38)],
 		"radius": 0.42, "height": 0.95}
+
+## Grey wolf: lean body, long snout, pointed ears, bushy tail. "eyes" is a
+## separate mesh so it can glow (creature.gd gives it an emissive material).
+static func _wolf() -> Dictionary:
+	var coat := Color(0.42, 0.42, 0.44)
+	var pale := Color(0.72, 0.71, 0.68)
+	var dark := Color(0.16, 0.15, 0.15)
+	var st := P._begin()
+	var r := _rng(231)
+	var n := _noise(231, 1.5)
+	P._blob(st, Vector3(0, 0.7, 0.05), Vector3(0.22, 0.24, 0.55), n, 0.15, coat, r, 1)
+	P._blob(st, Vector3(0, 0.8, -0.32), Vector3(0.24, 0.26, 0.3), n, 0.25, P._mul(coat, 1.08), r, 1)   # ruff
+	P._blob(st, Vector3(0, 0.6, -0.1), Vector3(0.16, 0.12, 0.35), n, 0.1, pale, r, 1)               # belly
+	P._blob(st, Vector3(0, 0.92, -0.62), Vector3(0.15, 0.14, 0.17), n, 0.12, coat, r, 1)            # head
+	P._cylinder(st, Vector3(0, 0.88, -0.72), Vector3(0, 0.83, -0.95), 0.09, 0.05, 6, pale, r, -1.0, dark)   # snout
+	for s in [-1.0, 1.0]:
+		P._cylinder(st, Vector3(s * 0.08, 1.02, -0.6), Vector3(s * 0.1, 1.2, -0.58), 0.05, 0.008, 4, P._mul(coat, 0.85), r)
+	# Bushy tail, hanging down and back.
+	P._cylinder(st, Vector3(0, 0.78, 0.55), Vector3(0, 0.5, 0.85), 0.07, 0.05, 5, coat, r)
+	P._blob(st, Vector3(0, 0.45, 0.9), Vector3(0.06, 0.08, 0.06), n, 0.2, pale, r, 0)
+	var est := P._begin()
+	for s in [-1.0, 1.0]:
+		P._blob(est, Vector3(s * 0.065, 0.97, -0.75), Vector3.ONE * 0.022, n, 0.0, Color(1.0, 0.8, 0.3), r, 0)
+	return {"body": P._commit(st), "eyes": P._commit(est), "leg": _leg(0.52, 0.045, 0.03, coat, dark, 232),
+		"hips": [Vector3(-0.11, 0.52, -0.38), Vector3(0.11, 0.52, -0.38), Vector3(-0.11, 0.54, 0.38), Vector3(0.11, 0.54, 0.38)],
+		"radius": 0.32, "height": 1.0}