Add disabled OpenCode Zen provider scaffold #577

Job	Run time
build-freebuff	1m 25s
build-and-smoke-freebuff-windows	2m 39s
e2e-version	58s
e2e-startup	1m 17s
e2e-help-command	1m 7s
e2e-terminal-command	59s
e2e-code-edit	52s
e2e-ads-behavior	1m 13s
e2e-agent-startup	2m 26s
e2e-slash-commands	56s
	13m 52s

Provide feedback