Add comprehensive documentation and package building target

📚 Documentation:
- VERSION_MANAGEMENT.md: Complete setuptools-scm guide
- Enhanced PACKAGE_PUBLISHING.md: Full workflow documentation
- Version calculation examples and troubleshooting
- Release process and best practices

🎯 New Makefile Target:
- `make package`: Build distribution packages with version info
- Automatic cleanup and detailed package information
- Supports both wheel and source distributions

✨ Features Documented:
- Git tag-based version management
- Development vs release versions
- Complete release workflows
- Gitea registry integration
- CI/CD integration examples

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

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

Makefile

@@ -32,6 +32,7 @@ help:
 	@echo "  test-new    - Create new test file template"
 	@echo "  test-coverage       - Analyze test coverage"
 	@echo "  build       - Build the package"
+	@echo "  package     - Build distribution packages (wheel + sdist)"
 	@echo "  lint        - Run code linting"
 	@echo "  format      - Format code"
 	@echo ""
@@ -485,6 +486,22 @@ build: $(VENV)/bin/activate
 	$(VENV_PYTHON) -m build 2>/dev/null || \
 	$(VENV_PIP) install build && $(VENV_PYTHON) -m build
 
+# Build distribution packages with version info
+package: $(VENV)/bin/activate
+	@echo "📦 Building distribution packages..."
+	@echo ""
+	@echo "📍 Current version (setuptools-scm):"
+	@$(VENV_PYTHON) -m setuptools_scm 2>/dev/null || echo "   setuptools-scm not available"
+	@echo ""
+	@echo "🧹 Cleaning previous builds..."
+	@rm -rf build/ dist/ *.egg-info/ 2>/dev/null || true
+	@echo "🏗️  Building wheel and source distribution..."
+	@$(VENV_PIP) install build setuptools-scm >/dev/null 2>&1 || true
+	$(VENV_PYTHON) -m build --wheel --sdist
+	@echo ""
+	@echo "✅ Packages built successfully:"
+	@ls -lah dist/ 2>/dev/null || echo "   No packages found"
+
 # Release management (setuptools-scm)
 release-status:
 	@echo "🔍 Checking release status (setuptools-scm)..."