Fundamental Oscillation: A Unified Framework for Mass, Frequency, and Spacetime (v1.1)

Fundamental Oscillation: A Unified Framework for Mass, Frequency, and Spacetime. Version 1.1 — Revised. This work presents a unified framework in which every massive body possesses a real fundamental frequency f₀ = mc²/h, carried by the F-filament in a spectrally reactive medium (the Fabric) structured into seven frequency layers. The decoherence level D = 0.489 ± 0.010, extracted from 536 Fast Radio Bursts, serves as the single empirical parameter — physically interpreted as a universal stability parameter, not a measure of deviation. Mass is defined as the discrepancy between f₀ and the Fabric background frequency f_T. The observed 3+1 dimensions are derived from SO(4) → SO(3)×U(1) breaking on K₃ = S³. Five empirical anchors support the framework. A previously claimed sixth anchor (PKIKP seismic delays) has been withdrawn after independent verification against ISC data (July 2026). Nine open theoretical problems and three laboratory tests are formulated. Changes in v1.1: PKIKP seismic anchor withdrawn after failed ISC verification. Number of empirical anchors reduced from six to five. Appendix C removed and replaced with a withdrawal note. Physical interpretation of D as universal stability parameter added. Minor corrections and updated references.