Add disabled OpenCode Zen provider scaffold (#623) #6506

Job	Run time
build-and-check	2m 52s
test-integration-packages/internal	1m 15s
test-integration-packages/billing	1m 2s
test-integration-web	43s
test-integration-sdk	1m 14s
test-integration-cli	45s
test-common	40s
test-integration-packages/agent-runtime	46s
test-packages/billing	44s
test-packages/agent-runtime	48s
test-cli	1m 5s
test-sdk	43s
test-integration-common	46s
test-web	1m 6s
test-packages/internal	49s
test-.agents	46s
	16m 4s

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