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A verification and grounding layer for AI-driven genome writing. Foundation models and a grounded co-scientist agent propose edits; PEN-STACK checks each against validated tools, never a language model: where a write is safe and durable, which enzyme makes it, and where it goes off-target. Calibrated, provenance-tracked, pre-registered.
Hierarchical certification framework (5-gate TrueWriterScore) for programmable genome editors, with sensitivity analysis, cross-pipeline triangulation, and a RAG Q&A layer over the PEN-STACK.