feat: Phase 2 (fragment migration), Phase 3 (testing infrastructure), Phase 4 (CI/CD)

Phase 2: Fragment Migration
- Migrated 42 ingredients to 54 fine-grained fragments
- Replaced %include with %ksappend syntax
- Created organized fragment structure (platform/generic-43, platform/generic-rawhide, shared/)
- Updated generator to use fragment paths
- All 16 manifest variants generate successfully

Phase 3: Testing Infrastructure
- Created containerized test runner (tests/container/)
- Added integration test suite (tests/integration/)
- Created golden master fixtures (tests/fixtures/expected_recipes/)
- 41 tests passing (36 unit + 5 integration)
- 54 fragments, 16 recipes validated

Phase 4: CI/CD Integration
- 5 new workflows: validate-recipes, validate-fragments, test-generation, container-tests, build-iso
- Added validation gates before ISO builds
- Works with existing fedora-runner-image
- Local testing support via act_runner

recipes_backup/live-server_intelcpu_intelgpu_rawhide.cfg

@@ -0,0 +1,21 @@
+#            __          ____                        ____  _____
+#     ____  / /_  __  __/ / /___  ____ ___  ___     / __ \/ ___/
+#    / __ \/ __ \/ / / / / / __ \/ __ `__ \/ _ \   / / / /\__ \
+#   / /_/ / / / / /_/ / / / /_/ / / / / / /  __/  / /_/ /___/ /
+#  / .___/_/ /_/\__, /_/_/\____/_/ /_/ /_/\___/   \____//____/
+# /_/          /____/
+
+# A recipe for a live server
+
+%include ../ingredients/live-core-storage.cfg
+%include ../ingredients/live-core-bootloader-grub.cfg
+%include ../ingredients/core-locale.cfg
+%include ../ingredients/core-services.cfg
+%include ../ingredients/core-network.cfg
+%include ../ingredients/core-packages.cfg
+%include ../ingredients/live-core-mandatory-packages.cfg
+%include ../ingredients/live-core-post.cfg
+%include ../ingredients/live-core-post-live-session.cfg
+%include ../ingredients/core-initial-setup-server.cfg
+%include ../ingredients/core-fedora-repo-rawhide.cfg
+%include ../ingredients/core-security-on.cfg