Add arachne — DSPy-native autonomous agent runtime

[Dan-StrategicAutomation]

Arachne is a DSPy-native autonomous agent runtime that weaves optimized execution DAGs from natural language goals, executes nodes in parallel waves, and autonomously self-heals on failure.

Features:

• GraphWeaver generates optimized execution DAGs from natural language
• WaveExecutor runs nodes in true parallel waves via asyncio
• TriangulatedEvaluator provides Rules, Semantic, and HITL quality gates
• AutoHealer autonomously retries, re-routes, or re-weaves on failure
• MCP client integration for external tool servers

280+ built-in skills across 20+ categories | 266 tests | MIT licensed

https://github.com/Strategic-Automation/arachne

[Dan-StrategicAutomation]

Self-closing: Arachne is beta/development stage and repo is < 3 months old. Doesn't meet the CONTRIBUTING.md criteria for production-ready, established projects. Will resubmit when criteria are met.