v0.3.0 — Smart Diff Engine + Code Memory + Shell Integration

What's New in v0.3.0

🔥 New Features

• Smart Diff Preview System — Beautiful colored diffs with hunk-by-hunk confirmation
• Code Context Memory — Persistent code index across sessions (supports 9 languages)
• Shell Integration — Bash/Zsh/Fish completions, terminal capability detection

🐳 Docker Support

• Multi-stage Dockerfile for minimal runtime image
• Docker Compose for development with optional Ollama service

📚 Documentation

• CONTRIBUTING.md with dev setup, plugin development, PR template
• GitHub issue templates (bug reports, feature requests)

🎨 Upgraded README

• Docker quick start guide
• Shell completion installation
• Architecture diagram
• Performance benchmarks

Full Changelog: v0.2.0...v0.3.0