fix(gemini): implement official hook contract

test/gemini-official.test.mjs

@@ -0,0 +1,48 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import {
+  createFixture,
+  runProcess,
+} from '../test-support/gemini-test-helpers.mjs';
+
+const geminiEntry = process.env.ELYDORA_GEMINI_ENTRY;
+
+test('official Gemini CLI accepts the installed user hook contract', {
+  skip: geminiEntry ? false : 'set ELYDORA_GEMINI_ENTRY to the official Gemini CLI entry file',
+}, async () => {
+  const fixture = await createFixture();
+  try {
+    const install = await fixture.install();
+    assert.equal(install.code, 0, install.stderr);
+    const environment = {
+      HOME: fixture.homeDir,
+      USERPROFILE: fixture.homeDir,
+      GEMINI_CLI_HOME: fixture.geminiCliHome,
+      GEMINI_API_KEY: 'official-loader-test-key',
+      GEMINI_TELEMETRY_ENABLED: 'false',
+      OTEL_SDK_DISABLED: 'true',
+    };
+    const version = await runProcess(
+      process.execPath,
+      [geminiEntry, '--version'],
+      environment,
+      fixture.projectDir,
+    );
+    assert.equal(version.code, 0, version.stderr);
+    assert.match(version.stdout, /0\.51\.0/);
+
+    const load = await runProcess(
+      process.execPath,
+      [geminiEntry, '--skip-trust', '--list-extensions'],
+      environment,
+      fixture.projectDir,
+    );
+    assert.equal(load.code, 0, load.stderr);
+    assert.doesNotMatch(
+      `${load.stdout}\n${load.stderr}`,
+      /invalid settings|settings validation|failed to parse|hook configuration error/i,
+    );
+  } finally {
+    await fixture.close();
+  }
+});