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terminal: the Agent button is the only Agent control #16

Job	Run time
checks (ship list, bundles, half-to-half parity)	14s
rust tests (the shell's 56 unit tests)	56s
build linux-x64	1m 30s
build mac-arm64	1m 19s
build win-x64	1m 19s
build ${{ matrix.rid }} (extra)	0s
release	1s
	5m 19s