The Bus — EchoMQ Supersedes

The platform's events, schedules, and jobs ride one owned bus. EchoMQ is a Valkey-native protocol — the braced emq:{q}: keyspace, branded JOB ids, every Lua key declared, the server's clock wherever a lease is touched, the wire fenced at echomq:3.0.0 — organized as twelve command families: admission, scheduling, repeat, claim, retry, flows, groups, batches, locks, metrics, data, lifecycle. Because the protocol is Valkey commands and inline Lua, any runtime that speaks them is a first-class peer: the polyglot seam is proven by a non-BEAM reader standing in the same consumer group as the BEAM consumers, draining the same pending-entries list.

On this bus, Encore's closed primitives are superseded one by one. A topic becomes a retained, replayable stream; a cron entry becomes a registration whose every occurrence is a fresh branded mint, released by the promote pump on the server's clock; a task queue becomes an atomic claim with a lease and a fencing token, rotated fairly across groups by the Metronome — park, don't poll — and drained in bulk by batches. One primitive stays, and the chapter says so in amber: secrets remain platform-native. The workshop re-lands a topic, re-mints a cron, and declares the gap.

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