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Add a SCENE platform (scene.py) so each scene preset becomes a scene.* entity. Alexa / Google Assistant / HomeKit expose the scene, light, and switch domains — but NOT button — so the existing button.* scene entities are invisible to voice assistants. Scenes use a distinct unique_id so both coexist (buttons for dashboards, scenes for voice). - Register Platform.SCENE; bump manifest 0.4.0 -> 0.5.0 - README: "Voice Control (Alexa / Google / Siri)" guide (Nabu Casa cloud, manual skill linking, HomeKit bridge, voice-friendly naming)