refactor: remove deprecated retriever module
RecursiveRetriever was a failed approach, not carried into TRM5. - delete app/retriever/ (empty placeholder) - drop retriever + train blocks from config/default.yaml - renumber fidelity checklist 13->12 items (drop #4, shift up) - sync core-goal text, dir tree, module-interaction diagrams across CLAUDE.md, ARCHITECTURE.md, overview.md, README.md - reference/ kept intact as historical code
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