[codex] Add DeepSeek session trace exporter (#707) #6678

Job	Run time
build-and-check	2m 47s
test-integration-packages/billing	1m 14s
test-integration-packages/internal	1m 13s
test-integration-packages/agent-runtime	44s
test-integration-cli	42s
test-integration-web	39s
test-integration-common	50s
test-integration-sdk	1m 22s
test-packages/agent-runtime	42s
test-common	39s
test-packages/internal	57s
test-sdk	42s
test-.agents	44s
test-packages/billing	51s
test-web	1m 1s
test-cli	56s
	16m 3s

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