Release v0.5.0 - OpenCode Integration & Type Safety

🎉 New Features

• OpenCode CLI Integration: Added OpenCode as a first-class engine provider alongside Claude, Codex, Cursor, and CCR
  • Full registry-based provider pattern with JSON event streaming
  • Non-interactive execution via environment guardrails
  • XDG-compliant paths under OPENCODE_HOME (~/.codemachine/opencode)
  • Support for multiple authentication providers
  • Run with: codemachine opencode run or --engine opencode in workflows

🔧 Improvements

• Type Safety: Replaced 'any' types with 'unknown' and proper type guards throughout telemetry system
• Telemetry Refactoring: Implemented provider-specific telemetry parsers for better maintainability
• CCR Auth Simplification: Streamlined authentication using simple .enable marker instead of .credentials.json
• Engine Naming: Updated display names to be more descriptive (CCR → Claude Code Router, Claude → Claude Code)
• ESLint Configuration: Updated to use tseslint.config for better type safety

🐛 Fixes

• Process Cleanup: Improved child process termination with process group killing for Unix systems
• Environment Variables: Fixed OpenCode runner to properly merge process.env with provided env
• Race Conditions: Better handling of abort signals and process events

📚 Documentation

• Comprehensive updates across README, CLI reference, and workflow guides
• Added contributor credits for OpenCode integration