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/core/actions.gd

@@ -294,6 +294,37 @@ func butcher(player: Node3D, carcass: Node3D) -> bool:
 	carcass.queue_free()
 	return true
 
+# --- fishing ----------------------------------------------------------------------
+
+## Casts the held rod from `origin` along `dir`.
+func cast_line(player: Node3D, origin: Vector3, dir: Vector3, world: Node3D) -> bool:
+	var rod: Dictionary = ItemDB.get_item(player.held_item_id()).get("fishing", {})
+	if rod.is_empty() or player.global_position.distance_to(origin) > 2.5:
+		return false
+	if not player.survival.use_stamina(float(rod.get("stamina", 4))):
+		notify.emit("Too tired")
+		return false
+	var d := dir.normalized()
+	d.y = maxf(d.y, -0.2) + 0.35   # a lobbed cast, even when looking level
+	world.start_fishing(player, origin, d.normalized() * float(rod.get("cast_speed", 12.0)))
+	return true
+
+## Reels in. With a fish biting you land it; otherwise the line just comes in.
+func reel(player: Node3D, world: Node3D) -> bool:
+	var b: Node3D = world.bobber
+	if b == null or not is_instance_valid(b):
+		return false
+	var caught := ""
+	if b.state == "biting":
+		caught = b.fish
+	world.end_fishing()
+	if caught.is_empty():
+		return false
+	if _give(player, caught, 1) == 0:
+		world.drop_item(caught, 1, Transform3D(Basis(), player.global_position + Vector3(0, 0.1, 0)))
+	notify.emit("Caught a %s" % ItemDB.item_name(caught).to_lower())
+	return true
+
 ## Puts on the cloak in `slot` (swapping out any cloak you were wearing).
 func wear(player: Node3D, slot: int) -> bool:
 	var s = player.inventory.get_slot(slot)