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_bubble.gd

@@ -1,14 +1,14 @@
 extends GutTest
 
 # =============================================================================
-# Test: Gauntlet Candy Bubble System (v2) [Gauntlet #082]
+# Test: Candy Survival Candy Bubble System (v2) Candy Survival #082]
 # Covers bubble-specific scoring components, phase budgets, anti-stacking,
 # the 3x3 blast footprint, and the grow→explode lifecycle.
 # Runs headless (no multiplayer peer): elapsed_time = 0 so the final-30s window
 # is inactive unless a test sets it directly.
 # =============================================================================
 
-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")
 var manager
 var main_mock: Node
@@ -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