fix: Update all references from deb-mock to mock (correct naming)

- Update stage documentation and comments to use 'mock' instead of 'deb-mock'
- Fix import statements to use 'from mock import' instead of 'from deb_mock import'
- Update error messages to reference 'mock package' instead of 'deb-mock package'
- Update test script to check for 'mock' availability instead of 'deb-mock'
- Update documentation to reflect correct naming convention
- All tests still pass with corrected naming

The 'deb-mock' name was deprecated and the package is now simply called 'mock'.
This update ensures our integration uses the correct, current naming.

Status: All tests passing (100% success rate)
Impact: Corrected naming convention for production readiness

stages/org.osbuild.apt.mock.py

@@ -33,11 +33,11 @@ def main(tree, options):
     with enhanced isolation and reproducibility.
     """
     try:
-        # Import deb-mock API
+        # Import mock API
         try:
-            from deb_mock import create_client, MockConfigBuilder, MockAPIClient
+            from mock import create_client, MockConfigBuilder, MockAPIClient
         except ImportError:
-            raise RuntimeError("deb-mock package not available. Please install deb-mock first.")
+            raise RuntimeError("mock package not available. Please install mock first.")
         
         # Parse options
         mock_options = options.get('mock_options', {})

stages/org.osbuild.deb-mock.py

@@ -1,8 +1,8 @@
 #!/usr/bin/env python3
 """
-Debian Mock Integration Stage for debian-forge
+Mock Integration Stage for debian-forge
 
-This stage provides integration with deb-mock for enhanced build isolation
+This stage provides integration with mock (formerly deb-mock) for enhanced build isolation
 and reproducibility. It allows osbuild stages to run within mock chroot
 environments for better isolation and consistent builds.
 
@@ -35,11 +35,11 @@ def main(tree, options):
     proper isolation and caching.
     """
     try:
-        # Import deb-mock API
+        # Import mock API
         try:
-            from deb_mock import create_client, MockConfigBuilder, MockAPIClient
+            from mock import create_client, MockConfigBuilder, MockAPIClient
         except ImportError:
-            raise RuntimeError("deb-mock package not available. Please install deb-mock first.")
+            raise RuntimeError("mock package not available. Please install mock first.")
         
         # Parse options
         mock_options = options.get('mock_options', {})