feat: add tmux-viewer TUI for viewing CLI test sessions (#405) #5373

Job	Run time
build-and-check	3m 3s
test-.agents	46s
test-packages/agent-runtime	1m 1s
test-packages/internal	53s
test-cli	1m 21s
test-integration-packages/agent-runtime	47s
test-common	40s
test-integration-cli	38s
test-web	44s
test-packages/billing	42s
test-sdk	56s
test-integration-.agents	41s
test-integration-packages/billing	46s
test-integration-packages/internal	37s
test-integration-common	45s
test-integration-web	40s
test-integration-sdk	41s
	15m 41s

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