Many-Mode Fermion-Like Filling and Shell-Capacity Structure of Electron-Like ECSM Response Packets

This paper reports the V10 ECSM electron-like packet many-mode filling test. Building on the previous ECSM packet sequence, including Dirac-like single-packet propagation, response-potential dynamics, gauge-covariant phase coupling, and two-packet fermion-like antisymmetry, the work extends the construction into a finite many-mode filling structure. A basis of eight electron-like ECSM response-packet modes is constructed, organised into four spatial shell centres with two internal states per centre. The V10 notebook passes all 22 final criteria. Duplicate occupancy collapses the determinant to zero, same-shell orthogonal internal filling remains allowed, separated same-internal filling remains allowed, all finite modes can be filled once, and overflow by duplicate occupancy is forbidden. The test also shows that common unitary propagation preserves the filled determinant and Gram overlap structure to numerical precision. χ-deformed propagation preserves the same filling structure while changing the many-mode transport span, supporting the interpretation that χ modifies response transport without destroying fermion-like occupancy. The result is not claimed as a derivation of the periodic table, full many-body quantum field theory, or the spin-statistics theorem. It is presented as a reproducible many-mode bridge showing that the ECSM electron-like packet scaffold can support finite fermion-like filling, duplicate exclusion, and shell-capacity proxy behaviour.