feat: add tmux-viewer TUI for viewing CLI test sessions #5363

Job	Run time
build-and-check	2m 58s
test-packages/internal	45s
test-integration-cli	46s
test-.agents	50s
test-sdk	46s
test-cli	1m 14s
test-packages/billing	42s
test-packages/agent-runtime	54s
test-integration-packages/internal	46s
test-integration-packages/agent-runtime	48s
test-common	39s
test-integration-common	46s
test-integration-packages/billing	43s
test-integration-.agents	39s
test-integration-sdk	47s
test-integration-web	44s
test-web	47s
	15m 34s

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