P35: LLM Tagging — closed-vocab RAG tagging into bib/Zotero

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Closed-vocabulary RAG tagging of comments using the Zotero corpus: curated vocab, batch tagging chain (implements #254's thematic tagging), idempotent llm: write-back to bib synced to Zotero, golden-set precision/recall gate, search web UI, and observability. #255/#256 consume this. Spec: docs/superpowers/specs/2026-07-16-llm-module-design.md

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