fix(opencode): install discoverable atomic plugin

test/opencode-official.test.mjs

@@ -0,0 +1,38 @@
+import assert from 'node:assert/strict';
+import path from 'node:path';
+import test from 'node:test';
+import {
+  createFixture,
+  environment,
+  runProcess,
+} from '../test-support/opencode-test-helpers.mjs';
+
+const binary = process.env.ELYDORA_OPENCODE_BINARY;
+
+test(
+  'official OpenCode 1.18 discovers the generated global JavaScript plugin',
+  { skip: binary ? false : 'set ELYDORA_OPENCODE_BINARY to the official OpenCode executable' },
+  async () => {
+    const fixture = await createFixture();
+    try {
+      assert.equal((await fixture.install()).code, 0);
+      const env = {
+        ...environment(fixture),
+        OPENCODE_DISABLE_AUTOUPDATE: 'true',
+        OPENCODE_DISABLE_MODELS_FETCH: 'true',
+      };
+      const version = await runProcess(binary, ['--version'], env, fixture.projectDir);
+      assert.equal(version.code, 0, version.stderr);
+      assert.match(version.stdout, /^1\.18\./);
+      const paths = await runProcess(binary, ['debug', 'paths'], env, fixture.projectDir);
+      assert.equal(paths.code, 0, paths.stderr);
+      assert.equal(paths.stdout.includes(path.join(fixture.configRoot, 'opencode')), true);
+      const info = await runProcess(binary, ['debug', 'info'], env, fixture.projectDir);
+      assert.equal(info.code, 0, info.stderr);
+      assert.match(info.stdout, /elydora-audit\.js/);
+      assert.doesNotMatch(info.stdout, /elydora-audit\.mjs/);
+    } finally {
+      await fixture.close();
+    }
+  },
+);