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

scripts/ui/pause_menu.gd

@@ -7,7 +7,8 @@ const UITheme = preload("res://scripts/ui/theme.gd")
 
 const CONTROLS := [
 	["W A S D", "Move"], ["Shift", "Sprint"], ["Space", "Jump / swim up"],
-	["Mouse", "Look"], ["E", "Interact / pick up"], ["Left click", "Use tool / place"],
+	["Mouse", "Look"], ["E", "Interact / pick up / add fuel"], ["Left click", "Use tool / place"],
+	["Right click (holding food)", "Eat"],
 	["R", "Rotate piece"], ["1 - 8, wheel", "Hotbar"], ["Tab", "Inventory & crafting"],
 	["Shift + click", "Move stack to/from a chest"], ["Right click", "Split stack"],
 	["Esc", "This menu (game autosaves every 2 min)"],