Black Holes as Single-Boundary Regimes Under ¯\(ツ)/¯

This artifact models black holes under Structural Flow as single-Boundary regimes. Its core claim is structural and scope-bound. A black hole is treated here not as a primitive anomaly or a replacement-physics object, but as a density-descended, post-formation collapse regime in which density load crosses the Boundary failure threshold: distributed local Boundary support can no longer remain load-bearing, local density-legibility fails within the interior, and Persistence continues at system scale within an enclosing Boundary at horizon scale, where the minimum hinge conditions for outward-valid density-legible consequence become available again. The paper works downstream of the current Structural Flow canon. It does not reopen primitive closure, density closure, or irreducible failure-regime closure. It does not claim to derive Einstein’s equations, replace general relativity, solve quantum gravity, or introduce a new primitive, hinge, or failure genus. The argument develops through canon inheritance and translation discipline, black holes as density-descended and post-formation objects, the single-Boundary regime definition, threshold architecture, interior illegibility and horizon reavailability, closure discipline, a guarded opening into formula-space, and an observational / empirical handoff. The paper’s purpose is narrower than replacing existing physics. It asks whether Structural Flow can identify the structural condition that black-hole physics is describing while leaving existing mathematics in place.