Enterprise agentic AI governance in 2026 fails at the operational layer even when it passes at the compliance layer. Boards receive EU-AI-Act-mapped compliance decks while the agentic deployments actually shipping out of IT ops have no measurable overlap with that deck. Durability requires six instrumented dimensions scored 0–100 (GAUGE framework) with a 90-day setup cadence and a 12-month trajectory target — not a compliance matrix.

Based on April 2026 corpus review of published governance-framework deployments + post-cutover analysis of the 88% failure rate (Stanford DEL ACA-2026-003), the 28% I&O pay-off rate (Gartner ANA-2026-002), and the 40% projected cancellation rate (Gartner ANA-2026-001). 60-day review cadence with explicit watches on (a) cross-enterprise studies testing dimensional scoring's predictive power, (b) analyst firms adopting similar instrumented-dimension models, (c) regulatory frameworks evolving to score deployment quality vs only classify risk tier.