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>

.gitignore

@@ -0,0 +1,74 @@
+# Node.js
+node_modules/
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+dist/
+.npm
+.eslintcache
+
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+build/
+develop-eggs/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+.pytest_cache/
+.coverage
+htmlcov/
+.tox/
+.hypothesis/
+*.cover
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# IDEs
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+.DS_Store
+
+# Logs
+logs/
+*.log
+~/.kicad-mcp/
+
+# Environment
+.env
+.env.local
+.env.*.local
+
+# KiCAD
+*.kicad_pcb-bak
+*.kicad_sch-bak
+*.kicad_pro-bak
+*.kicad_prl
+*-backups/
+fp-info-cache
+
+# Testing
+test_output/
+schematic_test_output/
+coverage.xml
+.coverage.*
+
+# OS
+Thumbs.db
+Desktop.ini