feat: implement CLI e2e tests

tests/e2e/TEST-REPORTS.md

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+# E2E Test Reports
+
+Task Master's E2E tests now generate comprehensive test reports similar to Playwright's reporting capabilities.
+
+## Test Report Formats
+
+When you run `npm run test:e2e:jest`, the following reports are generated:
+
+### 1. HTML Report
+- **Location**: `test-results/e2e-test-report.html`
+- **Features**:
+  - Beautiful dark theme UI
+  - Test execution timeline
+  - Detailed failure messages
+  - Console output for each test
+  - Collapsible test suites
+  - Execution time warnings
+  - Sort by status (failed tests first)
+
+### 2. JUnit XML Report
+- **Location**: `test-results/e2e-junit.xml`
+- **Use Cases**:
+  - CI/CD integration
+  - Test result parsing
+  - Historical tracking
+
+### 3. Console Output
+- Standard Jest terminal output with verbose mode enabled
+
+## Running Tests with Reports
+
+```bash
+# Run all E2E tests and generate reports
+npm run test:e2e:jest
+
+# View the HTML report
+npm run test:e2e:jest:report
+
+# Run specific tests
+npm run test:e2e:jest:command "add-task"
+```
+
+## Report Configuration
+
+The report configuration is defined in `jest.e2e.config.js`:
+
+- **HTML Reporter**: Includes failure messages, console logs, and execution warnings
+- **JUnit Reporter**: Includes console output and suite errors
+- **Coverage**: Separate coverage directory at `coverage-e2e/`
+
+## CI/CD Integration
+
+The JUnit XML report can be consumed by CI tools like:
+- Jenkins (JUnit plugin)
+- GitHub Actions (test-reporter action)
+- GitLab CI (artifact reports)
+- CircleCI (test results)
+
+## Ignored Files
+
+The following are automatically ignored by git:
+- `test-results/` directory
+- `coverage-e2e/` directory
+- Individual report files
+
+## Viewing Historical Results
+
+To keep historical test results:
+1. Copy the `test-results` directory before running new tests
+2. Use a timestamp suffix: `test-results-2024-01-15/`
+3. Compare HTML reports side by side