UCP Skill — Universal Commerce Protocol Implementation Core Principles 1. Edge runtime is NOT USED — Only Node.js (default) or Bun (opt-in) runtimes 2. Interactive error handling — When ambiguous, ask the user how to proceed 3. Config-driven — All decisions persist in 4. Spec-grounded — All implementations reference the canonical UCP specification 5. Next.js conventions — Follow App Router patterns for code organization 6. Deep analysis — Use AST parsing and data flow tracing for gap detection --- Spec Repository Handling Location Priority Check in this order: 1. — User's local copy (use as-i…