P41: eCFR Jump Links — bidirectional CFR cite ↔ URL
P40's pattern applied to eCFR: deterministic cite↔URL transmutation (short-form section URLs + semantic #p- paragraph fragments, round-trip law tested), bib regulation-item context for placement/validation, Zotero child links via the existing placement path, :pincite: cfr locator resolution, notebook cfr_md helper, cfr-jump CLI. Spec: docs/superpowers/specs/2026-08-17-ecfr-jump-links-design.md
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