A Smooth 5D Braneworld Black Hole Model with a Horizon Brane-Bulk Transition Mechanism (Final Honest V2.2)

This is the latest revised, mathematically disciplined, and academically honest Final Honest V2.2 version of the 5D braneworld black hole model series. Original first version: https://zenodo.org/records/19646289 Intermediate revised version: https://zenodo.org/records/19650511 This paper presents a formally well-defined, falsifiable conjecture of a 5D braneworld black hole with a horizon brane-bulk transition mechanism. The model is smooth, horizon-regular, asymptotically recovers 4D Schwarzschild geometry, and is testable via black hole shadow and gravitational-wave observations. No unproven claims are made regarding curvature regularity, energy conditions, or geodesic completeness; all open items are clearly labeled for future derivation.