feat: add tmux-viewer TUI for viewing CLI test sessions #5369

Job	Run time
build-and-check	2m 33s
test-packages/internal	54s
test-integration-.agents	40s
test-cli	1m 6s
test-integration-cli	42s
test-integration-packages/billing	40s
test-integration-common	40s
test-packages/agent-runtime	56s
test-integration-web	44s
test-common	38s
test-packages/billing	50s
test-.agents	44s
test-integration-sdk	40s
test-integration-packages/agent-runtime	42s
test-web	40s
test-sdk	44s
test-integration-packages/internal	46s
	14m 39s

Provide feedback