Remove placeholder tests and clean up test structure

- Delete placeholder E2E test file that only tested mocked values
- Remove empty integration test directories (aws/, claude/, github/)
- Clean up package.json test scripts (removed test:integration and test:e2e)
- Update CI workflow to remove E2E test job

These placeholder tests provided no real value as they only verified
hardcoded mock responses. Real E2E and integration tests can be added
when there's actual functionality to test.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -91,32 +91,6 @@ jobs:
         GITHUB_WEBHOOK_SECRET: 'test-secret'
         GITHUB_TOKEN: 'test-token'
 
-  # E2E tests - only 1 scenario, run on GitHub for simplicity
-  test-e2e:
-    name: E2E Tests
-    runs-on: ubuntu-latest
-    
-    steps:
-    - name: Checkout code
-      uses: actions/checkout@v4
-
-    - name: Setup Node.js
-      uses: actions/setup-node@v4
-      with:
-        node-version: ${{ env.NODE_VERSION }}
-        cache: 'npm'
-        cache-dependency-path: 'package-lock.json'
-
-    - name: Install dependencies
-      run: npm ci --prefer-offline --no-audit
-
-    - name: Run e2e tests
-      run: npm run test:e2e
-      env:
-        NODE_ENV: test
-        BOT_USERNAME: '@TestBot'
-        GITHUB_WEBHOOK_SECRET: 'test-secret'
-        GITHUB_TOKEN: 'test-token'
 
   # Coverage generation - depends on unit tests
   coverage: