[Feat] Add Code Mode toggle in Experimental settings

[roomote-roomote]

Opened on behalf of Daniel Riccio. Follow up by mentioning @roomote-roomote, in the web UI, or in Slack.

What changed

Adds a deployment-level Code Mode toggle under Settings → Experimental. When enabled, task workers inject OPENCODE_EXPERIMENTAL_CODE_MODE=1 into the OpenCode runtime env so MCP tools can be deferred behind OpenCode CodeMode (search/execute) instead of always listing every MCP schema.

Why this change was made

Admin teams wanted a Roomote app control to enable OpenCode’s experimental CodeMode path (for reducing rarely-used MCP tool context) without hand-editing environment YAML or shell env vars on every host.

Impact

Admins see a new Experimental Code Mode switch (off by default). Enabling it applies to subsequent task runs on the deployment by setting the OpenCode CodeMode runtime flag.

Screenshots

[roomote-roomote]

1 issue outstanding. See task

• apps/worker/src/run-task/run-task.ts:713 The toggle is a no-op with Roomote's default OpenCode CLI. The runtime is pinned to OpenCode 1.17.8, which does not implement CodeMode or read OPENCODE_EXPERIMENTAL_CODE_MODE, so enabling this setting still exposes every MCP schema. Upgrade the default runtime to a CodeMode-capable release (and verify the behavior) before exposing this switch.

_{Reviewed 9462927}