[codex] Add incremental chat completion traces (#708) #6683

Job	Run time
build-and-check	2m 59s
test-integration-packages/internal	1m 3s
test-integration-packages/billing	1m 5s
test-integration-common	47s
test-integration-sdk	1m 17s
test-integration-packages/agent-runtime	40s
test-integration-cli	45s
test-integration-web	47s
test-.agents	39s
test-packages/billing	45s
test-web	1m 3s
test-common	46s
test-packages/agent-runtime	42s
test-packages/internal	57s
test-cli	1m 2s
test-sdk	52s
	16m 9s

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