LT: Verified Pub/Sub
summary
A proof-of-concept verified Pub/Sub for Elixir/Phoenix that encodes topics and message shapes in a manifest module and generates pub/sub helpers with Spark macros. Broadcasting, subscribing and a handle_message macro mirror Phoenix PubSub but add compile-time verification: wrong message names or unhandled messages produce compile errors. Implemented as five hours of vibe coding, not yet in production or on Hex, repo linked, API still evolving and intended to prevent mismatched payloads across modules.
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