AdmitV1: Shear Admittance over the Fluxset

AdmitV1 is the membership statement of the Shear book. A spend is admissible if and only if it extracts a note from the committed live fluxset J without naming which flowline carried it. Amounts remain sealed commits; rest-frame strings never appear on the wire. Day-one crypto is a linkable full-set proof on ristretto255 against every admitPub in appearance order. The public root jroot is a Merkle commitment of those points, written on the coinbase. Double-spend is a repeated spendTag. This note states the architecture, the maps from spend seed and dest payload to the ring point P, the prove and verify relations as shipped, and the intended later accumulator change (AdmitV2) that does not alter J.