The sdk names no transport

Task 3.7 of novox/hq ADR 0116, and the whole of the sdk's diff for the bus
change. Three comments said AMQP where they meant 'message headers' and 'a
broker client'; the code never spoke it, which is why no module is rebuilt
for any of this (ADR 0039).

src/events/index.ts

@@ -4,7 +4,7 @@
 // credential — just the broker's topic routing). Declared as emits/consumes on the manifest so the
 // mesh knows the event graph.
 //
-// Identity and provenance ride as AMQP headers, not in the body (novox/hq ADR 0042): a consumer —
+// Identity and provenance ride as message headers, not in the body (novox/hq ADR 0042): a consumer —
 // or the broker, or an audit tool — reads who/when/what without parsing the payload, and the body
 // is only the domain payload. This surface hides the header/exchange/queue mechanics; a module
 // names a type and a body and never sees the wire.