Refactor code structure for improved readability and maintainability; optimize performance in key functions.

.gitea/workflows/offline-e2e.yml

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+name: Offline E2E Tests
+
+on:
+  pull_request:
+    paths:
+      - 'src/AirGap/**'
+      - 'src/Scanner/**'
+      - 'tests/offline/**'
+  schedule:
+    - cron: '0 4 * * *'  # Nightly at 4 AM UTC
+  workflow_dispatch:
+
+env:
+  STELLAOPS_OFFLINE_MODE: 'true'
+  DOTNET_VERSION: '10.0.100'
+
+jobs:
+  offline-e2e:
+    runs-on: ubuntu-22.04
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: ${{ env.DOTNET_VERSION }}
+
+      - name: Cache NuGet packages
+        uses: actions/cache@v3
+        with:
+          path: ~/.nuget/packages
+          key: ${{ runner.os }}-nuget-${{ hashFiles('**/*.csproj') }}
+          restore-keys: |
+            ${{ runner.os }}-nuget-
+
+      - name: Download offline bundle
+        run: |
+          # In real scenario, bundle would be pre-built and cached
+          # For now, create minimal fixture structure
+          mkdir -p ./offline-bundle/{images,feeds,policies,keys,certs,vex}
+          echo '{}' > ./offline-bundle/manifest.json
+
+      - name: Build in isolated environment
+        run: |
+          # Build offline test library
+          dotnet build src/__Libraries/StellaOps.Testing.AirGap/StellaOps.Testing.AirGap.csproj
+
+          # Build offline E2E tests
+          dotnet build tests/offline/StellaOps.Offline.E2E.Tests/StellaOps.Offline.E2E.Tests.csproj
+
+      - name: Run offline E2E tests with network isolation
+        run: |
+          # Set offline bundle path
+          export STELLAOPS_OFFLINE_BUNDLE=$(pwd)/offline-bundle
+
+          # Run tests
+          dotnet test tests/offline/StellaOps.Offline.E2E.Tests \
+            --logger "trx;LogFileName=offline-e2e.trx" \
+            --logger "console;verbosity=detailed" \
+            --results-directory ./results
+
+      - name: Verify no network calls
+        if: always()
+        run: |
+          # Parse test output for any NetworkIsolationViolationException
+          if [ -f "./results/offline-e2e.trx" ]; then
+            if grep -q "NetworkIsolationViolation" ./results/offline-e2e.trx; then
+              echo "::error::Tests attempted network calls in offline mode!"
+              exit 1
+            else
+              echo "✅ No network isolation violations detected"
+            fi
+          fi
+
+      - name: Upload results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: offline-e2e-results
+          path: ./results/
+
+  verify-isolation:
+    runs-on: ubuntu-22.04
+    needs: offline-e2e
+    if: always()
+
+    steps:
+      - name: Download results
+        uses: actions/download-artifact@v4
+        with:
+          name: offline-e2e-results
+          path: ./results
+
+      - name: Generate summary
+        run: |
+          echo "## Offline E2E Test Summary" >> $GITHUB_STEP_SUMMARY
+          echo "" >> $GITHUB_STEP_SUMMARY
+
+          if [ -f "./results/offline-e2e.trx" ]; then
+            # Parse test results
+            TOTAL=$(grep -o 'total="[0-9]*"' ./results/offline-e2e.trx | cut -d'"' -f2 || echo "0")
+            PASSED=$(grep -o 'passed="[0-9]*"' ./results/offline-e2e.trx | cut -d'"' -f2 || echo "0")
+            FAILED=$(grep -o 'failed="[0-9]*"' ./results/offline-e2e.trx | cut -d'"' -f2 || echo "0")
+
+            echo "| Metric | Value |" >> $GITHUB_STEP_SUMMARY
+            echo "|--------|-------|" >> $GITHUB_STEP_SUMMARY
+            echo "| Total Tests | ${TOTAL} |" >> $GITHUB_STEP_SUMMARY
+            echo "| Passed | ${PASSED} |" >> $GITHUB_STEP_SUMMARY
+            echo "| Failed | ${FAILED} |" >> $GITHUB_STEP_SUMMARY
+            echo "" >> $GITHUB_STEP_SUMMARY
+
+            if grep -q "NetworkIsolationViolation" ./results/offline-e2e.trx; then
+              echo "❌ **Network isolation was violated**" >> $GITHUB_STEP_SUMMARY
+            else
+              echo "✅ **Network isolation verified - no egress detected**" >> $GITHUB_STEP_SUMMARY
+            fi
+          else
+            echo "⚠️ No test results found" >> $GITHUB_STEP_SUMMARY
+          fi