vibe-qc 0.9.1 Patch release on top of v0.9.0 (Knowles's Kingfisher). 13 curated fixes from the v0.9.0 stabilization — QVF contract, solver audit (DMRG/v2RDM), BIPOLE init, symmetry edge case, pob-* citation headers, privacy + CI hardening. No new features. See CHANGELOG.md.