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Fix official API gaps in setup, MCP, event batches and mcode instructions #1778

Job	Run time
plan	7s
compose (ubuntu-24.04, amd64)	1m 16s
compose (ubuntu-24.04-arm, arm64)	1m 43s
hygiene	8s
backend (runtime)	1m 27s
example	2m 15s
distribution	38s
backend (integration 2/3)	2m 2s
website	28s
backend (integration 1/3)	2m 24s
backend (core)	2m 29s
harness	38s
backend (integration 3/3)	2m 26s
api / official-client	1m 28s
web	1m 9s
native / platform (darwin-arm64)	3m 51s
native / Core installer (macOS Intel)	1m 13s
native / platform (linux-amd64)	2m 2s
native / platform (windows-amd64)	2m 46s
lint	-1s
web-acceptance (3)	2m 10s
web-acceptance (1)	3m 22s
web-acceptance (2)	1m 58s
web-acceptance (4)	2m 31s
check	8s
	40m 38s