Add temporal diagnostic evolution: protocol fires at epoch 4 of DFA

Replays per-epoch logged data from results/snapshot_evolution_v2/ through
the protocol thresholds.

Result: diagnostics (a) ||h_l|| explosion AND (b) ||g_L|| at floor BOTH
first fire at epoch 4 of DFA training. At that point, DFA test acc is
0.308 — its final value at epoch 100 is also 0.308. The protocol could
have walked back the headline 96 epochs before training finished.

DFA's gamma hovers at 0.087-0.107 for all 100 epochs. A reviewer looking
at acc+gamma would conclude 'DFA is hovering at 31% acc with ~0.10
alignment, both reasonable'. Wrong on both counts.

BP never fires any diagnostic at any epoch. Stays bounded at ||h_L||~200,
||g_L||~3-5e-5, accuracy climbs to 0.61.

This is the temporal validation of decision utility: the protocol catches
the pathology AS IT HAPPENS, not just retrospectively.

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