extract_v_act: pooled completion-token bottleneck act per module, v = unit-norm
mean pair diff (tstat flag default off, null at n=8 pairs). ActCapture is the
single hook shared by extraction, the live gate, and verification.
verify_v_act (pueue #24): rel diff 7.3e-4 hack / 7.7e-4 clean vs
out/diag/pinning_feats.pt on the v3 first_hack ckpt; min per-module cos 0.99997.
Co-Authored-By: Claudypoo <288921227+claudypoo@users.noreply.github.com>
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