first commit

tests/unit/errors/normalizeError.test.ts

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+import { describe, expect, it } from 'vitest'
+import { AppError, normalizeError } from '../../../src/errors'
+
+describe('normalizeError', () => {
+  it('preserves backend diagnostics in a safe application error', () => {
+    const error = normalizeError({
+      status: 409,
+      body: { error: { code: 'CONFLICT', message: '运行状态冲突', request_id: 'req-42' } },
+    })
+
+    expect(error).toBeInstanceOf(AppError)
+    expect(error).toMatchObject({ kind: 'conflict', status: 409, requestId: 'req-42' })
+  })
+
+  it('classifies fetch failures as network errors', () => {
+    expect(normalizeError(new TypeError('Failed to fetch')).kind).toBe('network')
+  })
+})