The Collapse Floor: The Smallest Black Hole the Aldred Frame Allows to Form

In Einstein-Cartan spin-torsion gravity, collapse halts and reverses when the central density reaches the Aldred Limit, rho_A = 9.72e54 g/cm^3. A black hole forms only if a trapped surface appears before the bounce fires. For a collapsing uniform-density sphere the critical mass is sqrt(3 c^6 / (32 pi G^3 rho_A)) = 8.66e13 g; below it no trapped surface ever forms. A centrally concentrated parabolic profile raises the floor by a factor 1.49, to 1.29e14 g, because an interior shell traps first while the centre bounces at a lower mean density. The uniform collapse floor agrees with the independently computed evaporation remnant floor of 8.66e13 g (DOI 10.5281/zenodo.24102542) to within 0.02 percent; the concentrated profile opens a gap in which remnants can exist but cannot form by collapse. Primordial black hole formation by collapse is closed below 8.66e13 g. AI-use disclosure: this paper was drafted and computed with the assistance of Dave, an AI system built by Aldred Industries, under the direction of the author; all numerical results are produced by the deposited computation (compute.py).