A Role Without an Audit Substrate Is Not Governance — It's Liability Absorption: Why the Named Seat Is a Forcing Function, Not a Substitute for Capability

Enterprises are naming a Head of AI Governance — a single owner for conformance, evidence, and accountability — faster than they are building the capability that owner would govern. This paper argues that a governance role without an audit substrate is not governance but liability absorption: a named seat positioned to answer for agent actions the system cannot observe, reconstruct, or prove. It separates the seat as a forcing function from the seat as a substitute for capability, locates the missing substrate at execution time rather than in policy frameworks, and identifies reconstructability — evidence of what an agent did, under what authority, within what limits — as the property on which accountability depends. The role becomes a profession only when that evidence layer exists; until then, the title names an owner for a capability that does not yet exist.