Migration Assistant (Meta-Skill)

Take a "help me migrate X → Y" request and produce a concrete, runnable checklist. The pipeline does four things:

1. classify the migration kind via an LLM tag (one of six tokens).

2. fetch_guide the most authoritative source for THAT migration:

   Classifier verdict	Best source	Routed skill
   OPENAI_V0_TO_V1	repo release notes	github
   PY2_TO_PY3	framework migration doc	multi-search-engine
   VUE2_TO_VUE3	framework migration doc	multi-search-engine
   REACT_CLASS_TO_HOOKS	framework migration doc	multi-search-engine
   CJS_TO_ESM	(fuzzy, synthesize)	multi-search-engine
   OTHER (default)	(synthesize)	deep-research

3. repo_context optionally inspects the current repo diff only when the prompt indicates that local repository context should shape the migration.