Spectrum Spectrum is Photon's unified messaging SDK. Write handler logic against one stream and deliver it through iMessage, WhatsApp Business, Terminal, or a custom provider. This skill targets 12.2.0; its code samples are TypeScript. Contract gate Identify the provider and load its topic file before writing provider-specific code. A sample is complete only when every import, method, content shape, platform ID, fallback, and thrown error belongs to 12.2.0 and the selected provider contract. The universal method existing does not prove that every provider implements it; read whenever support…