Add validation tests and ARM64 build plan documentation

Co-authored-by: hlohaus <983577+hlohaus@users.noreply.github.com>

docs/arm64-build-plan.md

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+# Future ARM64 Build Enhancement Plan
+
+This document outlines the plan for adding comprehensive ARM64 support to the g4f build system.
+
+## Current Status
+
+- **macOS ARM64**: ✅ Supported (native runners)
+- **Linux ARM64**: ⏳ Requires ARM64 runners or cross-compilation
+- **Windows ARM64**: ⏳ Requires ARM64 runners or cross-compilation
+
+## Implementation Plan for ARM64 Support
+
+### Phase 1: Linux ARM64 (Future Enhancement)
+```yaml
+# Add to .github/workflows/build-packages.yml
+build-linux-exe:
+  strategy:
+    matrix:
+      include:
+        - architecture: x64
+          runner: ubuntu-latest
+          runner-arch: x86_64
+        - architecture: arm64
+          runner: buildjet-4vcpu-ubuntu-2204-arm  # ARM64 runners
+          runner-arch: aarch64
+```
+
+### Phase 2: Windows ARM64 (Future Enhancement)  
+```yaml
+build-windows-exe:
+  strategy:
+    matrix:
+      include:
+        - architecture: x64
+          runner: windows-latest
+          runner-arch: x86_64
+        - architecture: arm64  
+          runner: windows-latest-arm64  # When available
+          runner-arch: arm64
+```
+
+### Phase 3: Cross-compilation Support
+For environments without native ARM64 runners:
+- Use Docker with QEMU emulation
+- Configure Nuitka for cross-compilation
+- Test compatibility and performance
+
+## Benefits of ARM64 Support
+
+1. **Performance**: Native ARM64 binaries run faster on ARM64 hardware
+2. **Compatibility**: Better support for Apple Silicon Macs and ARM64 Linux systems
+3. **Future-proofing**: ARM64 adoption is increasing across all platforms
+
+## Testing Requirements
+
+- Verify ARM64 binaries work on actual ARM64 hardware
+- Test performance compared to x64 binaries on ARM64 systems
+- Ensure compatibility with all g4f features
+
+## Notes
+
+- This is marked as a future enhancement because it requires ARM64 runners or cross-compilation setup
+- Current implementation provides a solid foundation for easy expansion
+- The build matrix is designed to accommodate additional architectures

scripts/validate-nuitka.sh

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+#!/bin/bash
+# Validation test for Nuitka build system
+
+set -e
+
+echo "=== G4F Nuitka Build Validation Test ==="
+echo "Testing the new Nuitka-based build system"
+
+# Test 1: Check if g4f_cli.py loads correctly
+echo "Test 1: Verifying g4f_cli.py entry point..."
+if python g4f_cli.py --help > /dev/null 2>&1; then
+    echo "✓ g4f_cli.py works correctly"
+else
+    echo "✗ g4f_cli.py failed"
+    exit 1
+fi
+
+# Test 2: Check if Nuitka is available
+echo "Test 2: Verifying Nuitka installation..."
+if python -m nuitka --version > /dev/null 2>&1; then
+    echo "✓ Nuitka is installed and working"
+else
+    echo "✗ Nuitka is not available"
+    exit 1
+fi
+
+# Test 3: Check if build script exists and is executable
+echo "Test 3: Verifying build script..."
+if [[ -x "scripts/build-nuitka.sh" ]]; then
+    echo "✓ Build script is executable"
+else
+    echo "✗ Build script is missing or not executable"
+    exit 1
+fi
+
+# Test 4: Check if workflow includes Nuitka
+echo "Test 4: Verifying GitHub Actions workflow..."
+if grep -q "nuitka" .github/workflows/build-packages.yml; then
+    echo "✓ Workflow uses Nuitka"
+else
+    echo "✗ Workflow doesn't use Nuitka"
+    exit 1
+fi
+
+# Test 5: Verify architecture support in workflow
+echo "Test 5: Verifying architecture matrix in workflow..."
+if grep -q "matrix:" .github/workflows/build-packages.yml && grep -q "architecture:" .github/workflows/build-packages.yml; then
+    echo "✓ Architecture matrix is present"
+else
+    echo "✗ Architecture matrix is missing"
+    exit 1
+fi
+
+echo "=== All Tests Passed! ==="
+echo "The Nuitka build system is properly configured."
+echo ""
+echo "Next steps:"
+echo "1. Test the build in CI environment"
+echo "2. Verify executable quality and performance"
+echo "3. Consider adding ARM64 Linux builds with dedicated runners"