feat: enhance logging capabilities, implement runtime diagnostics, and update preinstalled skills metadata

tests/log-helpers.test.ts

@@ -0,0 +1,46 @@
+import { describe, expect, it } from 'vitest';
+import { serializeError, serializeUnknownError, serializeUnknownForLog } from '../electron/utils/log-helpers';
+
+describe('log helpers', () => {
+  it('serializes Error instances with code and cause', () => {
+    const cause = new Error('inner failure');
+    const error = new Error('outer failure') as Error & { code?: string; cause?: unknown };
+    error.code = 'E_TEST';
+    error.cause = cause;
+
+    expect(serializeError(error)).toMatchObject({
+      name: 'Error',
+      message: 'outer failure',
+      code: 'E_TEST',
+      cause: {
+        name: 'Error',
+        message: 'inner failure',
+      },
+    });
+  });
+
+  it('normalizes string and object rejection values', () => {
+    expect(serializeUnknownError('boom')).toEqual({ message: 'boom' });
+    expect(serializeUnknownError({ message: 'failed', code: 500 })).toEqual({
+      message: 'failed',
+      code: 500,
+    });
+  });
+
+  it('recursively serializes nested error values for structured logging', () => {
+    const payload = serializeUnknownForLog({
+      task: 'bootstrap',
+      errors: [new Error('bad dependency')],
+    });
+
+    expect(payload).toEqual({
+      task: 'bootstrap',
+      errors: [
+        expect.objectContaining({
+          name: 'Error',
+          message: 'bad dependency',
+        }),
+      ],
+    });
+  });
+});