[codex] Add DeepSeek session trace exporter #6677

Job	Run time
build-and-check	2m 50s
test-integration-packages/internal	1m 13s
test-integration-sdk	1m 15s
test-integration-cli	50s
test-integration-common	51s
test-integration-web	39s
test-integration-packages/billing	1m 0s
test-packages/billing	43s
test-integration-packages/agent-runtime	42s
test-common	43s
test-.agents	39s
test-cli	56s
test-sdk	46s
test-packages/internal	51s
test-packages/agent-runtime	51s
test-web	1m 1s
	15m 50s

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