Possible experiments suggested by a "thread" picture of the electron: expected nulls and open checks

Three measurements that probe a 'thread' (worldline) picture of the electron where it is cheap or where standard theory is silent, each with the outcome we expect, published in advance. (1) Direction memory after a thin foil: compare multiple-scattering widths of cosmic-ray and test-beam electrons of equal energy; expected null, since electrons with different histories are indistinguishable (VIP-2 bound on Pauli violation < 4.7e-29). (2) Waiting in the detector: a threshold variant predicts an Erlang-shaped click delay and bursts (Fano factor > 1 on 0.2-30 s windows); test (b) is pre-registered separately. (3) Arrival time as thread crossing: spin-dependent arrival times of Das and Duerr (2019), a Bohmian prediction that would test whether one real thread per electron carries physical content. None of these predicts a new constant. Version 2 adds item 4: apparent acceleration from clock differences between voids and walls (Wiltshire's timescape), with tests (more supernovae, a joint CMB+BAO fit, Sandage–Loeb redshift drift with ELT/ANDES).