feat: Implement dynamic test-fix execution phase with adaptive task generation

- Added Phase 2: Test-Cycle Execution documentation outlining the process for dynamic test-fix execution, including agent roles, core responsibilities, intelligent strategy engine, and progressive testing.
- Introduced new PowerShell scripts for analyzing TypeScript errors, focusing on error categorization and reporting.
- Created end-to-end tests for the Help Page, ensuring content visibility, documentation navigation, internationalization support, and accessibility compliance.

ccw/frontend/tests/e2e/orchestrator.spec.ts

@@ -594,4 +594,161 @@ test.describe('[Orchestrator] - Workflow Canvas Tests', () => {
     monitoring.assertClean({ ignoreAPIPatterns: ['/api/workflows'], allowWarnings: true });
     monitoring.stop();
   });
+
+  // ========================================
+  // API Error Scenarios
+  // ========================================
+
+  test('L3.13 - API Error - 400 Bad Request', async ({ page }) => {
+    const monitoring = setupEnhancedMonitoring(page);
+
+    // Mock API to return 400
+    await page.route('**/api/workflows', (route) => {
+      if (route.request().method() === 'POST') {
+        route.fulfill({
+          status: 400,
+          contentType: 'application/json',
+          body: JSON.stringify({ error: 'Bad Request', message: 'Invalid workflow data' }),
+        });
+      } else {
+        route.continue();
+      }
+    });
+
+    // Try to create a node
+    const createButton = page.getByRole('button', { name: /create|add/i });
+    const hasCreateButton = await createButton.isVisible().catch(() => false);
+
+    if (hasCreateButton) {
+      await createButton.click();
+
+      // Verify error message
+      const errorMessage = page.getByText(/invalid|bad request|输入无效/i);
+      await page.unroute('**/api/workflows');
+      const hasError = await errorMessage.isVisible().catch(() => false);
+      expect(hasError).toBe(true);
+    }
+
+    monitoring.assertClean({ ignoreAPIPatterns: ['/api/workflows'], allowWarnings: true });
+    monitoring.stop();
+  });
+
+  test('L3.14 - API Error - 401 Unauthorized', async ({ page }) => {
+    const monitoring = setupEnhancedMonitoring(page);
+
+    // Mock API to return 401
+    await page.route('**/api/workflows', (route) => {
+      route.fulfill({
+        status: 401,
+        contentType: 'application/json',
+        body: JSON.stringify({ error: 'Unauthorized', message: 'Authentication required' }),
+      });
+    });
+
+    await page.reload({ waitUntil: 'networkidle' as const });
+
+    // Verify auth error
+    const authError = page.getByText(/unauthorized|not authenticated|未经授权/i);
+    await page.unroute('**/api/workflows');
+    const hasError = await authError.isVisible().catch(() => false);
+    expect(hasError).toBe(true);
+
+    monitoring.assertClean({ ignoreAPIPatterns: ['/api/workflows'], allowWarnings: true });
+    monitoring.stop();
+  });
+
+  test('L3.15 - API Error - 403 Forbidden', async ({ page }) => {
+    const monitoring = setupEnhancedMonitoring(page);
+
+    // Mock API to return 403
+    await page.route('**/api/workflows', (route) => {
+      route.fulfill({
+        status: 403,
+        contentType: 'application/json',
+        body: JSON.stringify({ error: 'Forbidden', message: 'Access denied' }),
+      });
+    });
+
+    await page.reload({ waitUntil: 'networkidle' as const });
+
+    // Verify forbidden message
+    const errorMessage = page.getByText(/forbidden|not allowed|禁止访问/i);
+    await page.unroute('**/api/workflows');
+    const hasError = await errorMessage.isVisible().catch(() => false);
+    expect(hasError).toBe(true);
+
+    monitoring.assertClean({ ignoreAPIPatterns: ['/api/workflows'], allowWarnings: true });
+    monitoring.stop();
+  });
+
+  test('L3.16 - API Error - 404 Not Found', async ({ page }) => {
+    const monitoring = setupEnhancedMonitoring(page);
+
+    // Mock API to return 404
+    await page.route('**/api/workflows/nonexistent', (route) => {
+      route.fulfill({
+        status: 404,
+        contentType: 'application/json',
+        body: JSON.stringify({ error: 'Not Found', message: 'Workflow not found' }),
+      });
+    });
+
+    // Try to access a non-existent workflow
+    await page.goto('/orchestrator?workflow=nonexistent-workflow-id', { waitUntil: 'networkidle' as const });
+
+    // Verify not found message
+    const errorMessage = page.getByText(/not found|doesn't exist|未找到/i);
+    await page.unroute('**/api/workflows/nonexistent');
+    const hasError = await errorMessage.isVisible().catch(() => false);
+    expect(hasError).toBe(true);
+
+    monitoring.assertClean({ ignoreAPIPatterns: ['/api/workflows'], allowWarnings: true });
+    monitoring.stop();
+  });
+
+  test('L3.17 - API Error - 500 Internal Server Error', async ({ page }) => {
+    const monitoring = setupEnhancedMonitoring(page);
+
+    // Mock API to return 500
+    await page.route('**/api/workflows', (route) => {
+      route.fulfill({
+        status: 500,
+        contentType: 'application/json',
+        body: JSON.stringify({ error: 'Internal Server Error' }),
+      });
+    });
+
+    await page.reload({ waitUntil: 'networkidle' as const });
+
+    // Verify server error message
+    const errorMessage = page.getByText(/server error|try again|服务器错误/i);
+    await page.unroute('**/api/workflows');
+    const hasError = await errorMessage.isVisible().catch(() => false);
+    expect(hasError).toBe(true);
+
+    monitoring.assertClean({ ignoreAPIPatterns: ['/api/workflows'], allowWarnings: true });
+    monitoring.stop();
+  });
+
+  test('L3.18 - API Error - Network Timeout', async ({ page }) => {
+    const monitoring = setupEnhancedMonitoring(page);
+
+    // Mock API timeout
+    await page.route('**/api/workflows', () => {
+      // Never fulfill - simulate timeout
+    });
+
+    await page.reload({ waitUntil: 'networkidle' as const });
+
+    // Wait for timeout handling
+    await page.waitForTimeout(3000);
+
+    // Verify timeout message
+    const timeoutMessage = page.getByText(/timeout|network error|unavailable|网络超时/i);
+    await page.unroute('**/api/workflows');
+    const hasTimeout = await timeoutMessage.isVisible().catch(() => false);
+
+    monitoring.assertClean({ ignoreAPIPatterns: ['/api/workflows'], allowWarnings: true });
+    monitoring.stop();
+  });
 });