Port OpenCode entrypoint to V2 API (desktop 2.0.22)

[Shadrous]

The OpenCode entrypoint (opencode/index.js) fails on V2 (Expected object at [default]).

• export default Plugin.define({ id: 'open-plan-annotator', setup }) from @opencode/plugin 2.0.22
• annotate_plan tool via ctx.tool.transform, system prompt via ctx.session.hook('context')
• Added root index.js re-export so the V2 loader resolves the package directory correctly
• Verified: bun test 99 pass, typecheck/lint clean, loads in desktop 2.0.22 with no warnings
• Note: opencode plugin add from git still fails at dep prep (bun toolchain); local path works: { "package": "<repo>/opencode"

[ndom91]

Thanks for this! Will have a look shortly

[ndom91]

I checked the port against the 2.0.22 types and the API usage all looks right. Two things need changing before we can merge:

Blocking

1. Keep V1 working. Removing the OpenPlanAnnotatorPlugin export breaks everyone still on OpenCode 1.x the moment they upgrade. Could we export both, the V1 function as a named export plus the V2 object as the default? Worth checking that the V1 loader is OK with a non-function default export.
2. Drop the @opencode/plugin dependency. Plugin.define just returns its argument. The dependency adds about 600 lockfile lines plus solid-js/@opentui peer deps for every user, including people on Claude Code only. A plain export default { id, setup } with a JSDoc @type import does the same job.

Nits

• The context hook event already includes event.agent, so you can drop the session.get + agent.list() calls on every model step.
• getAgentList: the response is always { data }, so the bare-array branch and the candidate.id match can go.
• With no implementation agent, the approval text says "Execute the approved plan directly now" twice.
• The root index.js isn't in files, so it never ships. Either add it there or remove it.
• Please add the JSDoc types back on the new functions. opencode/ relies on them, and typecheck doesn't cover that directory.