Initial Release

Added

• TypeScript runtime with isolated sandbox execution
• E2B, Docker, Vercel, and Cloudflare sandbox providers
• Multi-model support (Anthropic, OpenAI, Google, OpenRouter)
• Streaming SSE API with Hono server
• TypeScript SDK (@sandcaster/sdk)
• Ink-based CLI with rich TUI
• 6 built-in starters: general-assistant, research-brief, document-analyst, support-triage, api-extractor, security-audit
• Composite multi-sandbox orchestration
• Speculative branching
• Skills system (SKILL.md)
• sandcaster.json configuration
• Slack bot integration