Add new tmux-cli agent to codebuff base2! #5892

Job	Run time
build-and-check	3m 2s
test-integration-packages/internal	1m 7s
test-integration-common	43s
test-integration-packages/billing	1m 12s
test-integration-cli	50s
test-integration-sdk	1m 22s
test-integration-web	42s
test-packages/agent-runtime	39s
test-common	42s
test-.agents	46s
test-cli	50s
test-web	46s
test-integration-packages/agent-runtime	42s
test-sdk	39s
test-packages/internal	46s
test-packages/billing	47s
	15m 35s

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