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Event-driven CommandService dispatches exact case-sensitive #command matches on COMMAND_CHANNEL (default 2) through a single-registration-point registry; first command #ping -> #pong!. Replies ride COMMAND_CHANNEL: directed DM back to the sender when present, else broadcast. Failing handler/send only logs a warn. DI: CommandModule's factory injects MeshService and attaches itself via MeshService.attachCommands() — a constructor-level cycle leaves one side null in NestJS 12's injector (verified), so no forwardRef is used. Tests 106 -> 121; docs synced (AGENTS.md, MESHTASTIC.md, README).