The missing term was unary: omit-size solved at its ceiling in 1.4s

Adversarial review of the artifacts found three of my numbers to be
artifacts of my own code. All three reproduced here before acceptance:

- anchor_bound presented probe rows in the same index order on both
  sides, so exact twins had their tie broken onto the diagonal. 0.997 ->
  0.920 on omit-size. Fixed by scrambling the T-side presentation.
- The truth is not a strict local minimum: 51 transpositions have
  exactly zero energy delta. fast_pair_descent only looked stationary
  because its break test treats zero as no-improvement.
- scipy's FAQ takes no n_init, so it was swallowed into unknown_options
  and 'FAQ x30 restarts' computed bit-identically to plain FAQ. Replaced
  with a real restart loop over P0='randomized'.

The blind ceiling for omit-size is 0.836, not 1.0: the text field has 51
exact transposition automorphisms, so T[s,s] is bitwise identical to T
and no objective f(V, P T P^T) can separate an orbit at any order. Every
synthetic accuracy was being divided by the wrong denominator.

The fifteen failed solvers share one property -- all purely quadratic or
purely spectral, none with a node-level term. Eight moments of each
node's own field row, blended with the quadratic term through
Frank-Wolfe, reach 0.837 with an energy gap of exactly zero. The term
must stay in the loop: as a seed for pure-quadratic descent it scores
0.21, pinned through the iterations it scores 0.84 -- which is also why
amplification plateaued, being itself pure-quadratic.

Co-Authored-By: Claude <noreply@anthropic.com>

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diff --git a/artifacts/spectral_frontier_probe/eval_voteanchor_vs_bestE.log b/artifacts/spectral_frontier_probe/eval_voteanchor_vs_bestE.log
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+
+##### hidden seed 11: 150 ICP sols in 200s, E(truth)=0.3396, best member E=0.6569 acc=0.172
+  ROUTE A (descend 5 lowest-E, blind pick): E=0.5863 acc=0.277
+   m=10 K= 12 prec=0.333 expand=0.102 -> descent acc=0.320 E=0.6184
+   m=10 K= 25 prec=0.333 expand=0.168 -> descent acc=0.324 E=0.6279
+   m=10 K= 50 prec=0.255 expand=0.184 -> descent acc=0.793 E=0.3544
+   m=10 K=100 prec=0.193 expand=0.172 -> descent acc=0.770 E=0.3900
+   m=30 K= 12 prec=0.455 expand=0.211 -> descent acc=0.535 E=0.4867
+   m=30 K= 25 prec=0.292 expand=0.195 -> descent acc=0.754 E=0.4163
+   m=30 K= 50 prec=0.227 expand=0.188 -> descent acc=0.695 E=0.4357
+   m=30 K=100 prec=0.172 expand=0.184 -> descent acc=0.773 E=0.3837
+   m=60 K= 12 prec=0.455 expand=0.086 -> descent acc=0.094 E=0.7738
+   m=60 K= 25 prec=0.375 expand=0.164 -> descent acc=0.133 E=0.6840
+   m=60 K= 50 prec=0.244 expand=0.098 -> descent acc=0.066 E=0.7911
+   m=60 K=100 prec=0.171 expand=0.113 -> descent acc=0.086 E=0.7412
+  ROUTE B (blind pick by energy over the 12 cells): m=10 K=50 E=0.3544 acc=0.793   [best cell by accuracy was 0.793]
+  wall 492s
+
+##### hidden seed 23: 150 ICP sols in 559s, E(truth)=0.3396, best member E=0.3684 acc=0.691
+  ROUTE A (descend 5 lowest-E, blind pick): E=0.3396 acc=0.852
+   m=10 K= 12 prec=0.917 expand=0.703 -> descent acc=0.855 E=0.3396
+   m=10 K= 25 prec=0.680 expand=0.520 -> descent acc=0.758 E=0.3792
+   m=10 K= 50 prec=0.583 expand=0.484 -> descent acc=0.777 E=0.3543
+   m=10 K=100 prec=0.505 expand=0.492 -> descent acc=0.848 E=0.3396
+   m=30 K= 12 prec=0.917 expand=0.656 -> descent acc=0.812 E=0.3466
+   m=30 K= 25 prec=0.920 expand=0.723 -> descent acc=0.809 E=0.3396
+   m=30 K= 50 prec=0.673 expand=0.691 -> descent acc=0.816 E=0.3644
+   m=30 K=100 prec=0.558 expand=0.547 -> descent acc=0.797 E=0.3593
+   m=60 K= 12 prec=0.833 expand=0.504 -> descent acc=0.785 E=0.3468
+   m=60 K= 25 prec=0.792 expand=0.734 -> descent acc=0.820 E=0.3396
+   m=60 K= 50 prec=0.667 expand=0.641 -> descent acc=0.836 E=0.3433
+   m=60 K=100 prec=0.524 expand=0.496 -> descent acc=0.844 E=0.3569
+  ROUTE B (blind pick by energy over the 12 cells): m=30 K=25 E=0.3396 acc=0.809   [best cell by accuracy was 0.855]
+  wall 752s