Governed Hazard Predicates and Assurance Cases for STA Runtime Oversight

This record is Paper 5 of the Signal-Time-Authority (STA) Series. Paper 5 completes the STA Series by adding the governance and assurance-case layer. It focuses on governed hazard predicates, authority ownership, multi-principal conflicts, stakeholder risk, contestability, residual-risk registers, evidence quality levels, claim degradation, and assurance-case framing. Paper 1 introduces the STA pre-commitment controllability framework: https://doi.org/10.5281/zenodo.19980763 Paper 2 provides staged C++17 synthetic toy-simulation evidence: https://doi.org/10.5281/zenodo.19984104 Paper 3 specifies authority governors and runtime deployment architecture: https://doi.org/10.5281/zenodo.19984352 Paper 4 extends STA to physical AI safe-stop authority and actuator commitment: https://doi.org/10.5281/zenodo.19984706 This paper does not claim to prove AI safety, provide legal advice, or replace domain-specific standards, certification, regulator review, or professional governance processes. It frames STA deployment claims as bounded, auditable, contestable, and withdrawable assurance claims. This is a PublicRelease v1.0 record.