Enable OpenCode Zen for any opencode/-prefixed model #6510

Job	Run time
build-and-check	3m 1s
test-integration-packages/billing	1m 5s
test-integration-packages/internal	1m 15s
test-integration-packages/agent-runtime	43s
test-integration-cli	45s
test-integration-web	43s
test-integration-common	46s
test-common	51s
test-cli	55s
test-integration-sdk	1m 21s
test-packages/billing	39s
test-packages/internal	51s
test-packages/agent-runtime	43s
test-.agents	47s
test-sdk	49s
test-web	3m 11s
	18m 25s

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