BU58 Compton Limit, Schwarzschild Radius, and Hubble Radius under B_U Microscopic Localization Redline, Strong-Compression Structural Pruning, Cosmological Readout Horizon, and the Reclassification of Physical Scale Redlines

This paper develops BU58 as a B_U-based reclassification of the Compton limit, Schwarzschild radius, and Hubble radius as projection-level scale redline readouts. Its central claim is that these scales are not ontic boundaries of B_U itself, but structural redlines manifested when total reality enters different readable windows under fixed-boundary consistency, dynamic-completeness audit, finite projection, and settlement conditions. The Compton limit is classified as the microscopic localization redline. It marks the scale at which particle-level localization, object identity, and microscopic disturbance retention enter audit pressure. The Schwarzschild radius is classified as the strong-compression pruning redline. It marks the scale at which path-space, horizon readout, local geometry, and external observability are reclassified under strong gravitational compression. The Hubble radius is classified as the cosmological readout horizon. It marks the large-scale window through which global correlation, observational reach, and cosmological settlement are read out under the current expansion condition. BU58 further clarifies that resolution-level advancement does not replace the ontic boundary of B_U. As resolution advances, new readable windows open, new settlement redlines manifest, and new standing obtains admission. Window change produces readout change; it does not modify B_U’s fixed-boundary consistency. The final judgment is that the Compton limit, Schwarzschild radius, and Hubble radius form a three-scale redline skeleton: microscopic localization, strong-compression horizon formation, and cosmological readout. Together they protect finite reality windows from infinite localization, infinite compression, and infinite extrapolation.