II b Exact Finite Packet Sieves and Survivor Convolutions for Symmetric Diagonal Affine Systems

This version substantially revises and consolidates the previous finite local sieve draft. It presents the work as the merged Paper II of the current program, combining local residue-cloud obstruction geometry with finite packet-sieve counts, survivor convolutions, and fiber-moment identities. The exposition has been recalibrated so that classical analytic theories are used only as external comparison and validation points, not as inputs to the finite results.

Previous version of this preprint:
https://zenodo.org/records/20447546

Companion preprint:
https://zenodo.org/records/20259817