Final revision: audit fixes, cross-scheme comparisons, known-plaintext stage

- exclude the all-ones Walsh-Hadamard row and test every key family
  against the all-ones guess
- pass the model dimension to the noise scaling so the key-length sweep
  runs at a fixed per-dimension SNR
- known-plaintext attack with nested accumulation and common random
  numbers, averaged over 40 collections
- key sensitivity and brute-force search extended to the permutation
  key and the index cipher
- make_tables regenerates all three result tables from the CSVs

data/sec_brute_cmp.csv

@@ -0,0 +1,8 @@
+K,ser_mask,ser_perm,ser_pad,best_kappa,best_frac
+1,0.9993678262,0.9999544349,0.9999847412,0.1909643153,0.0160546875
+10,0.9948030015,0.9999095052,0.9998474121,0.4626973216,0.041015625
+100,0.9825717055,0.9998648567,0.9984741211,0.6342127242,0.0658203125
+1000,0.9568330187,0.9998315989,0.9847412109,0.7432459045,0.084296875
+10000,0.909109588,0.9997988333,0.8474121094,0.8165387856,0.1025
+100000,0.8435049061,0.9997690911,0,0.8680494354,0.1190234375
+1000000,0.7503523409,0.9997409661,0,0.905556646,0.1346484375

data/sec_maskfam.csv

@@ -1,5 +1,5 @@
-family,legit_ser,eve_ser,mask_xcorr
-random,0.64962,0.998488,0.2709003091
-hadamard,0.2568,0.9995605,0
-learned,0.2762895,0.9999285,0.007116591092
-learned_reg,0.315952,0.9999555,0.01121100038
+family,legit_ser,eve_ser,eve_ones_ser,mask_xcorr
+random,0.64962,0.998488,0.999988,0.2709003091
+hadamard,0.257299,0.9999905,0.9999755,0
+learned,0.2762895,0.9999285,0.99999,0.007116591092
+learned_reg,0.315952,0.9999555,0.9999175,0.01121100038

data/sec_regjam.csv

@@ -1,8 +1,8 @@
 jsr_db,plain,regularized
--10,0.46879,0.4691633333
--5,0.6335366667,0.6307333333
-0,0.8056466667,0.8018166667
-5,0.9187366667,0.91602
-10,0.9708533333,0.9693866667
-15,0.9902133333,0.9896433333
-20,0.9967333333,0.9965933333
+-10,0.46703,0.4719866667
+-5,0.6348,0.6301533333
+0,0.8073133333,0.80122
+5,0.9191366667,0.91577
+10,0.9707266667,0.96911
+15,0.9901433333,0.99006
+20,0.9968333333,0.9964333333

data/sec_sens_cmp.csv

@@ -0,0 +1,11 @@
+frac,ser_mask,ser_perm,ser_pad
+0,0.99998375,0.9999833333,0.9999847412
+0.2,0.9997954167,0.9996233333,0.999859778
+0.4,0.9985329167,0.9949383333,0.9987114181
+0.6,0.99153625,0.9540933333,0.9881584643
+0.75,0.9644704167,0.880335,0.9375
+0.85,0.88742875,0.7279433333,0.8105354292
+0.9,0.7780379167,0.5716733333,0.6701230223
+0.94,0.6256225,0.4316466667,0.4859430867
+0.97,0.43810125,0.3708666667,0.283022376
+1,0.2756983333,0.3021566667,0