The irreversible bit

This short foundational note proposes the Irreversible Bit (IB) as a time-first primitive: the minimal distinction preserved across a globally non-invertible commit-step. From this primitive, temporally preserved distinguishables, mediated adjacency, records, and space are presented as progressively stabilized structures. The note is intended as a compact conceptual foundation and priority record for later formal development.Formal-direction note: A possible mathematical analogue for the QB stage is a Bergman-type admissibility projection, where a projection operator extracts a coherent admissible sector from ambient content. This analogy is not developed in v0.9 and is deferred to later work. Related prior note: Kernel Geometry on the Unit Ball in C4, DOI: 10.5281/zenodo.18031409.