chore: TIER-2 READ conductor/code_styleguides/error_handling.md before Phase 13
Phase 13: rag_engine migration (9 sites: 1 SS + 5 BC + 3 RETHROW). rag_engine.py is the smallest baseline file. Single phase since 9 sites fit comfortably. Migration rules (per TIER1_REVIEW Phase 9 redo): - SS sites (1): MIGRATE to Result[T] (no logging, no pass, no empty default) - BC sites (5): narrow to specific types; if body returns structured error carrier use Heuristic E match; otherwise migrate to Result[T] - RETHROW sites (3): classify per Pattern 1/2/3; if Pattern 1 fits add 'from e'; if suspicious catch+bare-raise migrate to Result[T] rag_engine is a RAG subsystem (vector store). Most sites are likely at the SDK boundary (chromadb, embedding providers). Pattern matches should be straightforward.
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