Torqued Substrate Theory — Spacetime / Relativity (Expanded Module)

This document presents the Spacetime / Relativity Expanded Module of Torqued Substrate Theory (TST). Spacetime is treated as a projection-level representational structure arising from admissibility, ordering, and closure under oriented recursion. No ontological commitment to spacetime as substance, container, or primitive arena is made. The module establishes the emergence of dimensionality, metric structure, relativistic invariance, causality, and breakdown conditions, and provides a clean handoff to the Gravity / General Relativity Expanded Module. This module presumes familiarity with the core TST framework. Version note: This release corrects a containment-notation error in earlier versions where ontological dependence was incorrectly expressed using formal containment notation. The formal containment invariant is ⟦Φ⟧ ⊂ Δ ⊂ ⟦O⟧. Earlier versions remain accessible for record integrity.