feat(poc): implement Sprint 1 proof of concept

- project.godot with autoload configuration
- Reception room with placeholder visuals
- Draggable Character with DragDropComponent
- Interactive flower object with bounce animation
- GameState, SaveManager, AudioManager, InputManager autoloads
- HUD with back button and music toggle

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/autoload/SaveManager.gd

@@ -0,0 +1,40 @@
+## SaveManager — persists game state as JSON to user://savegame.json, auto-saves on state_changed.
+extends Node
+
+const SAVE_PATH: String = "user://savegame.json"
+
+
+func _ready() -> void:
+	GameState.state_changed.connect(_on_state_changed)
+
+
+func save_game() -> void:
+	var data: Dictionary = GameState.get_save_data()
+	var file: FileAccess = FileAccess.open(SAVE_PATH, FileAccess.WRITE)
+	if file == null:
+		return
+	file.store_string(JSON.stringify(data))
+	file.close()
+
+
+func load_game() -> void:
+	if not FileAccess.file_exists(SAVE_PATH):
+		return
+	var file: FileAccess = FileAccess.open(SAVE_PATH, FileAccess.READ)
+	if file == null:
+		return
+	var raw: String = file.get_as_text()
+	file.close()
+	var parsed = JSON.parse_string(raw)
+	if parsed is Dictionary:
+		GameState.apply_save_data(parsed)
+
+
+func reset_game() -> void:
+	if FileAccess.file_exists(SAVE_PATH):
+		DirAccess.remove_absolute(SAVE_PATH)
+	GameState.apply_save_data({})
+
+
+func _on_state_changed() -> void:
+	save_game()