Three defects surfaced by running the analyzer over a full local
collection against shipped checkpoints.
The requantize path hardcoded use_svd=False, but network_add_weights
requantizes with the layer's own svd setting and rank. On an svd
checkpoint the dequantized weight is not on the plain integer grid, so
requantizing without svd produced an error dominated by the discarded
correction and roughly orthogonal to the delta, which read back as a
retention near 1.0 on a grid where the delta is 0.005 of a step. Thread
use_svd, svd_rank and svd_steps through and reuse the returned factors.
Targets whose weight is not a matrix (norm and scale parameters, 205 of
them in one z-image extraction) reached the quantizer and the module stub,
both of which unpack two dimensions and raised. Skip and count them before
either. An all-zero delta (some full-rank extractions ship empty .diff)
divided by its own norm and reported nan; its retention is undefined
rather than erased, so it is excluded from the medians and counted.
CalamitousFelicitousness
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