LFIS–07: Drift–Sink System (S12–S13) and Cosmological Integration

LFIS–07 derives the drift-sink system (S12–S13) governing large-scale cadence flow in Light Frame Cadence Geometry. Drift is defined as the outward radial Temporal Stretch (TS) gradient, while sinks are defined as localized inward Temporal Depth (TD) gradients associated with mass-phase storage. Using the Cadence Ledger neutrality condition from LFIS–03, the volume shows that extended TS drift cannot accumulate indefinitely across cosmic domains: over sufficiently large connected volumes, signed drift cancels while positive drift demand is paired with localized sink response. This establishes the cadence-geometric basis for large-scale drift-sink balance, void-interior smoothness, and sink termination at finite-capacity boundaries. LFIS–07 also introduces an effective low-contrast cosmological closure and sketches the line-of-sight redshift accumulation route leading to the low-redshift linear Hubble relation, while clearly marking these cosmological statements as effective closures and framework inferences rather than standalone observational fits.