rename gauntlet→candy_survival + rewrite Candy Survival per boss design

- Rename enum GAUNTLET→CANDY_SURVIVAL, all gauntlet_*→candy_survival_*
- Rename files: gauntlet_manager→candy_survival_manager, candy_cannon→candy_survival_npc, gauntlet.tscn→candy_survival.tscn
- Rewrite candy_survival_manager.gd: blueprints, candy stack, Mekton delivery, Sugar Rush, knock/ghost charges, sticky-as-wall
- Update player_movement_manager.gd: smack→knock system, ghost integration
- All Candy Survival issues (#54-57, #65-70) retitled per boss design
- Shared managers (goals_cycle, goal, player_race, playerboard, turn) untouched

tests/test_gauntlet_cleanser.gd

@@ -1,13 +1,13 @@
 extends GutTest
 
 # =============================================================================
-# Test: Gauntlet Cleanser Power-Up (v2) [Gauntlet #072]
+# Test: Candy Survival Cleanser Power-Up (v2) Candy Survival #072]
 # Covers grant cadence (every 2 missions, max 1), 5-cell immunity lifecycle,
 # sticky clearing, stun-blocked activation, and the safe-stop early termination.
 # Runs headless; uses a GridMap mock so clear_sticky_cell can run locally.
 # =============================================================================
 
-const GauntletManager = preload("res://scripts/managers/gauntlet_manager.gd")
+const CandySurvivalManager = preload("res://scripts/managers/candy_survival_manager.gd")
 const GridMapMock = preload("res://tests/helpers/gridmap_mock.gd")
 const MainMock = preload("res://tests/helpers/main_mock.gd")
 var manager
@@ -20,7 +20,7 @@ func before_each():
 	gridmap_mock = GridMapMock.new()
 	gridmap_mock.name = "EnhancedGridMap"
 	main_mock.add_child(gridmap_mock)
-	manager = GauntletManager.new()
+	manager = CandySurvivalManager.new()
 	main_mock.add_child(manager)
 	manager.initialize(main_mock, gridmap_mock)
 	manager.current_phase = 0