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_save_load.gd

@@ -8,6 +8,7 @@ extends SceneTree
 ## Run: godot --headless --path . --script res://tests/test_save_load.gd
 
 var _fails := 0
+var _finished := false
 var A: Node    # Actions
 var S: Node    # Saves
 var DB: Node   # ItemDB
@@ -114,9 +115,11 @@ func _run() -> void:
 	check(chest2 != null and chest2.inventory.count("flint") == 7 and chest2.inventory.count("wood") == 12, "chest rebuilt with its contents")
 	check(S.read_meta(id).play_time >= 0.0, "meta updated")
 
+	_finished = true
 	world.queue_free()
 	S.delete_world(id)
 	DirAccess.remove_absolute(S.root_dir)
+	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)