fix(cli): emit the OpenCode plugin as a V2 default export

[AmirF194]

OpenCode's V2 plugin loader only reads the default export and requires an id plus a setup() or effect() function. cbm_client_adapter_opencode still generated the old named export (export const CodebaseMemory = async (ctx) => {...}), so every server start failed with SchemaError: Missing key at ["default"], and the workaround gets overwritten on every install/update since the file is regenerated.

Wrapped the same hook logic in a default export with id: 'codebase-memory-augment' and async setup(ctx); the returned hooks object (tool.execute.after, experimental.session.compacting) is unchanged.

Added a test asserting the generated module has the default export shape and no longer contains the old named export. Ran scripts/test.sh --suites agent_clients on Ubuntu 24.04: the new test fails without the change and the suite is green on the branch (38 tests).

Fixes #2077

[github-actions]

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[DeusData]

Thanks for taking #2077 on so quickly, and for the RED/GREEN evidence — the diagnosis is right: OpenCode's newer config loader validates default against { id, effect | setup }, so a default export is the way to go.

One thing turned up when running the generated module through OpenCode's own loaders, though. There are two of them, and the one that actually fires tool.execute.after is the server runtime (packages/opencode/src/plugin/index.ts → readV1Plugin in shared.ts). It reads default.server, not default.setup. With { id, setup } it throws Plugin … must default export an object with server(), and the V2 loader that accepts { id, setup } calls setup() but drops whatever it returns (packages/core/src/plugin/promise.ts:91) — its context has no tool domain yet. So on every 1.18.x checked (v1.18.18 / 25 / 29 and dev) this shape loads without an error line but registers zero hooks — the silent no-op #616 taught us to fear.

The shape that satisfies both loaders:

export default {
  id: 'codebase-memory-augment',
  // server runtime: reads default.server and dispatches the hooks it returns
  server: async (ctx) => { /* the existing hook object */ },
  // V2 config loader: requires id + setup|effect; no tool domain yet, so nothing to register
  setup() {},
};

Could you switch async setup(ctx) { to server: async (ctx) =>, add the empty setup() {}, and update the new test to pin server: and setup() {} (keeping the "no export const CodebaseMemory" check)? Also, #1933 lands first and changes output?.args → input?.args in the same block, so after rebasing please keep input?.args inside your rewritten block — its three assertions will tell you if it slipped. Then this is a merge. The red test-windows-guards leg on your head is the known cold-storm daemon-spawn race, unrelated to this diff.