This restricted manuscript presents a mechanically consistent investigation into the behavior of compact astrophysical objects under extreme spacetime conditions. The work reframes known observational phenomena within a generalized elastic interpretation of spacetime, focusing on internal consistency, limiting behavior, and phase-like transitions at high densities. Rather than introducing speculative entities or modifying observational datasets, the manuscript derives its conclusions from first-principle mechanical constraints and continuity requirements. The analysis addresses stability limits, transition thresholds, and observationally relevant regimes without disclosing implementation-specific mechanisms or proprietary parameterizations. The purpose of this record is to establish priority of a mechanically unified framework applicable to compact-object phenomenology, while withholding operational details pending further validation and controlled disclosure. Access is intentionally restricted. Keywords / Hashtags (Zenodo / AI‑crawler safe) Keywords: mechanical spacetime compact objects astrophysical limits mass-radius relations gravitational phenomenology continuum mechanics theoretical consistency high-density regimes Hashtags: #theoreticalphysics #astrophysics #compactobjects #mechanicalmodels #spacetime #fundamentalphysics #restrictedresearch