[codex] Route opencode chat models through Zen (#638) #6544

Job	Run time
build-and-check	3m 11s
test-integration-packages/billing	1m 6s
test-integration-packages/internal	1m 16s
test-integration-cli	42s
test-integration-sdk	1m 15s
test-integration-packages/agent-runtime	50s
test-integration-web	50s
test-.agents	39s
test-integration-common	50s
test-packages/agent-runtime	44s
test-cli	50s
test-packages/internal	57s
test-packages/billing	51s
test-common	51s
test-web	1m 23s
test-sdk	52s
	17m 7s

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