Transparent, local-first coding-agent harness for the JVM (Java 21): the five-lines Spectro facade, a typed RunEvent stream, tools, MCP, sessions and replay — the stream is the observability.

The spectroscope fleet: agents on a bus, one merged spectrum — BusEnvelope wire format, in-memory bus and a TCP ProcessBus with reconnect, at-least-once delivery and a bounded replay ring.