M1b: survival stats, day/night, fire fuel, cooking, foraging, torches, death + grave

- Health, stamina, hunger, warmth and wet with HUD bars, status tags and clock
- 20-minute day/night cycle with moon, stars and lit clouds
- Campfire fuel (2 min start, 15 min max), heat radius, cooking needs a lit fire
- Berry bushes (regrow 10 min), mushrooms, roasted mushroom, torch
- Stamina costs for sprint, jump and harvest hits
- Death respawns at island start and leaves a grave bag
- Saves include stats, time of day, fire fuel, regrowth timers and graves
- New test_survival_stats suite; tests fail if a script error aborts them

tests/test_survival_core.gd

@@ -6,6 +6,7 @@ extends SceneTree
 ## Run: godot --headless --path . --script res://tests/test_survival_core.gd
 
 var _fails := 0
+var _finished := false   ## set at the very end; a script error aborts before it
 var _actions: Node
 var _db: Node
 
@@ -28,6 +29,7 @@ func _run() -> void:
 	for _i in range(5):
 		await physics_frame
 	await _test_world(world)
+	check(_finished, "test ran to the end (no script errors)")
 	print("RESULT: %s (%d failures)" % ["PASS" if _fails == 0 else "FAIL", _fails])
 	quit(1 if _fails > 0 else 0)
 
@@ -134,6 +136,7 @@ func _test_world(world: Node3D) -> void:
 		var moving: int = inv.get_slot(wood_slot).count
 		_actions.transfer(player, inv, wood_slot, chest.inventory, chest)
 		check(chest.inventory.count("wood") == moving, "shift-click stored %d wood in the chest" % moving)
+	_finished = true
 
 func ItemDB_get(_p, id: String) -> Dictionary:
 	return _db.get_item(id)