feat: Week 1 complete - Linux support + IPC API prep

🎉 Major v2.0 rebuild kickoff - Week 1 accomplished!

## Highlights

### Cross-Platform Support 🌍
- ✅ Linux primary platform (Ubuntu/Debian tested)
- ✅ Windows fully supported
- ✅ macOS experimental support
- ✅ Platform-agnostic path handling (XDG spec)
- ✅ Auto-detection of KiCAD installation

### Infrastructure 🏗️
- ✅ GitHub Actions CI/CD pipeline
- ✅ Pytest framework with 20+ tests
- ✅ Pre-commit hooks (Black, MyPy, ESLint)
- ✅ Automated Linux installation script
- ✅ Enhanced npm scripts

### IPC API Migration Prep 🚀
- ✅ Comprehensive migration plan (30 pages)
- ✅ Backend abstraction layer (800+ lines)
- ✅ Factory pattern with auto-detection
- ✅ SWIG backward compatibility wrapper
- ✅ IPC backend skeleton ready

### Documentation 📚
- ✅ Updated README (Linux installation)
- ✅ CONTRIBUTING.md guide
- ✅ Linux compatibility audit
- ✅ IPC API migration plan
- ✅ Session summaries
- ✅ Platform-specific config templates

## Files Changed

- 27 files created
- ~3,000 lines of code/docs
- 8 comprehensive documentation pages
- 20+ unit tests
- 5 abstraction layer modules

## Next Steps

- Week 2: IPC API migration (project.py → component.py → routing.py)
- Migrate from deprecated SWIG to official IPC API
- JLCPCB/Digikey integration prep

🤖 Generated with Claude Code
https://claude.com/claude-code

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

python/kicad_api/__init__.py

@@ -0,0 +1,27 @@
+"""
+KiCAD API Abstraction Layer
+
+This module provides a unified interface to KiCAD's Python APIs,
+supporting both the legacy SWIG bindings and the new IPC API.
+
+Usage:
+    from kicad_api import create_backend
+
+    # Auto-detect best available backend
+    backend = create_backend()
+
+    # Or specify explicitly
+    backend = create_backend('ipc')  # Use IPC API
+    backend = create_backend('swig')  # Use legacy SWIG
+
+    # Connect and use
+    if backend.connect():
+        board = backend.get_board()
+        board.set_size(100, 80)
+"""
+
+from kicad_api.factory import create_backend
+from kicad_api.base import KiCADBackend
+
+__all__ = ['create_backend', 'KiCADBackend']
+__version__ = '2.0.0-alpha.1'