A Reduced Homeostatic Vector Space for Black Holes: Ripeness, Variance Geometry, and Host-Galaxy Regulation

Black holes are usually described through instantaneous observables such as mass, accretion rate, luminosity, or host-galaxy scaling residuals. This paper tests whether they can instead be embedded in a class-conditioned reduced homeostatic state space in which throughput, stability, residence, and retained history are treated as structured dynamical roles rather than isolated catalog columns. The present implementation is deliberately conservative. It uses a reduced Tier~1 realization of a broader $(H,R,S,M)$ program and activates only the coordinates that can be constructed robustly from the available simulation and survey products. The central time-domain result is that the residence-based ripeness functional, defined as the fraction of time a black-hole track occupies a bounded class-conditioned window, shows a robust decline in dispersion with final black-hole mass in the simulation branch, whereas the per-track median scalar potential does not survive robust re-estimation and is tail dominated. The leading observational result comes from source-driven GAMA rebuilds in which throughput is traced by [OIII] emission and stability is defined through class-relative stellar-age and kinematic offsets; the strongest branch yields a negative variance slope under a corrected permutation null. A full MaNGA IFU expansion to nearly seven thousand parent systems demonstrates that the IFU state-vector construction is computationally portable to survey scale, although the full MaNGA sample does not support a universal variance-compression claim. Finally, a contextual black-hole ripeness ranking shows that maturity is not reducible to mass alone: a stable upper core survives reduced-score variants, while the lowest-ranked systems are dominated by severe settlement penalties caused by catastrophic displacement from contextual phase-space geometry. The defensible contribution of the paper is therefore not a claim that every black-hole observable compresses monotonically with mass, but a demonstration that a reduced homeostatic vector space can separate robust time-domain regulation, source-driven observational analogues, and structurally interpretable maturity ranking within a single falsifiable framework.