Remove get_hinted_aff_expr

[luke-kiernan]

Companion to Sienna-Platform/PowerOperationsModels.jl#243, which addresses PowerOperationsModels.jl issue #224.

get_hinted_aff_expr is unexported and never called anywhere in IOM's src, test, or docs — it is dead code inside its own package. Its only consumers are in POM, which now defines it locally. Clean removal, no deprecation needed.

Merge order: land the POM PR first so IOM is never the broken side.

🤖 Generated with Claude Code

[github-actions]

Performance Results
Main

Network: 10 nodes, 13 edges, 3 cost segments
Generators: 5, Demands: 5
Loss coefficients (a, b, c) per generator:
  n1: a=0.007287  b=0.005968  c=0.003850
  n2: a=0.001094  b=0.009002  c=0.007028
  n3: a=0.007897  b=0.008552  c=0.003001
  n4: a=0.008179  b=0.002530  c=0.009637
  n5: a=0.009778  b=0.009934  c=0.009099

Solver logs: /home/runner/work/InfrastructureOptimizationModels.jl/InfrastructureOptimizationModels.jl/main/test/performance/logs/solver_2026-08-19T21-15-25.log

==============================================================================================================================================
Bilinear Approximation Benchmarks
  Refinement = depth for all methods
==============================================================================================================================================
Method          R   Vars Constrs   Bins    Objective   Gap(%) MIPGap(%)     LowerBnd  rmse δbi   max δbi   rmse δq    max δq  build_t  solve_t
----------------------------------------------------------------------------------------------------------------------------------------------
NLP (Ipopt)     -     40     105      0     0.956760        -         -            -  0.00e+00  0.00e+00  0.00e+00  0.00e+00   0.0249   0.0032

NLP (Uno)       -     40     105      0     0.956760   0.0000         -            -  0.00e+00  0.00e+00  0.00e+00  0.00e+00   0.0011   0.0010

Bin2+sSOS       4    190     535      0     1.180700  23.4061    0.0000     1.180700  8.07e-02  1.41e-01  2.49e+01  5.48e+01   0.0049   1.6044
Bin2+sSOS       6    250     655      0     1.098175  14.7806    0.0000     1.098175  1.26e-01  2.86e-01  5.47e+00  9.07e+00   0.0054   6.9648
Bin2+sSOS       8    310     775      0     1.053069  10.0661    0.0088     1.052976  8.62e-02  2.43e-01  4.18e+01  9.32e+01   0.0055  24.6537

Bin2+mSOS       4    310     805    120     1.180700  23.4061    0.0000     1.180700  8.07e-02  1.41e-01  2.49e+01  5.48e+01   0.0022   1.6300
Bin2+mSOS       6    430    1045    180     1.098175  14.7806    0.0092     1.098074  1.26e-01  2.86e-01  5.47e+00  9.07e+00   0.0024   7.0199
Bin2+mSOS       8    550    1285    240     1.053069  10.0661    0.0045     1.053021  8.62e-02  2.43e-01  4.18e+01  9.32e+01   0.0023  16.8363

Bin2+Saw        4    310    1075    120     0.985823   3.0376    0.0000     0.985823  1.08e-01  2.49e-01  1.11e+02  2.44e+02   0.0028   5.4300
Bin2+Saw        6    430    1495    180     0.958677   0.2004    0.0077     0.958603  7.52e-02  1.68e-01  8.94e+01  1.71e+02   0.0033  12.5597
Bin2+Saw        8    550    1915    240     0.956996   0.0247    0.0072     0.956927  7.52e-02  1.68e-01  1.37e+02  2.09e+02   0.0037  46.3282

HybS+sSOS       4    310    1165      0     0.812261  15.1030    0.0000     0.812261  5.52e-01  1.00e+00  2.04e+02  2.97e+02   0.0063   2.5024
HybS+sSOS       6    410    1545      0     0.891208   6.8515    0.0000     0.891208  5.49e-01  1.00e+00  3.69e+02  7.09e+02   0.0070   4.4186
HybS+sSOS       8    510    1925      0     0.934789   2.2965    0.0087     0.934707  5.48e-01  1.00e+00  3.47e+02  5.22e+02   0.0070  14.2526

HybS+mSOS       4    390    1345     80     0.812261  15.1030    0.0046     0.812224  5.52e-01  1.00e+00  2.04e+02  2.97e+02   0.0032   2.6817
HybS+mSOS       6    530    1805    120     0.891208   6.8515    0.0000     0.891208  5.49e-01  1.00e+00  3.69e+02  7.09e+02   0.0034   5.6152
HybS+mSOS       8    670    2265    160     0.934789   2.2965    0.0047     0.934744  5.48e-01  1.00e+00  3.47e+02  5.22e+02   0.0040  14.7987

HybS+Saw        4    390    1525     80     0.951869   0.5113    0.0021     0.951849  5.48e-01  1.00e+00  2.16e+03  4.23e+03   0.0037  12.3425
HybS+Saw        6    530    2105    120     0.956386   0.0391    0.0099     0.956291  5.48e-01  1.00e+00  4.57e+02  7.57e+02   0.0039  30.2509
HybS+Saw        8    670    2685    160     0.956734   0.0027    0.0014     0.956721  5.48e-01  1.00e+00  6.08e+00  1.07e+01   0.0048  97.3458

DNMDT           4    395    1640     80     0.954878   0.1967    0.0004     0.954874  1.39e-03  3.13e-03  4.70e-04  1.05e-03   0.0028   3.4668
DNMDT           6    550    2315    120     0.956636   0.0130    0.0098     0.956541  6.75e-05  1.57e-04  4.26e+03  9.54e+03   0.0033  15.4630
DNMDT           8    705    2990    160     0.956754   0.0007    0.0098     0.956660  4.62e-06  1.14e-05  9.42e+01  1.49e+02   0.0036  44.2752

==============================================================================================================================================

This branch

Network: 10 nodes, 13 edges, 3 cost segments
Generators: 5, Demands: 5
Loss coefficients (a, b, c) per generator:
  n1: a=0.007287  b=0.005968  c=0.003850
  n2: a=0.001094  b=0.009002  c=0.007028
  n3: a=0.007897  b=0.008552  c=0.003001
  n4: a=0.008179  b=0.002530  c=0.009637
  n5: a=0.009778  b=0.009934  c=0.009099

Solver logs: /home/runner/work/InfrastructureOptimizationModels.jl/InfrastructureOptimizationModels.jl/branch/test/performance/logs/solver_2026-08-19T21-22-43.log

==============================================================================================================================================
Bilinear Approximation Benchmarks
  Refinement = depth for all methods
==============================================================================================================================================
Method          R   Vars Constrs   Bins    Objective   Gap(%) MIPGap(%)     LowerBnd  rmse δbi   max δbi   rmse δq    max δq  build_t  solve_t
----------------------------------------------------------------------------------------------------------------------------------------------
NLP (Ipopt)     -     40     105      0     0.956760        -         -            -  0.00e+00  0.00e+00  0.00e+00  0.00e+00   0.0250   0.0034

NLP (Uno)       -     40     105      0     0.956760   0.0000         -            -  0.00e+00  0.00e+00  0.00e+00  0.00e+00   0.0011   0.0010

Bin2+sSOS       4    190     535      0     1.180700  23.4061    0.0000     1.180700  8.07e-02  1.41e-01  2.49e+01  5.48e+01   0.0050   1.6046
Bin2+sSOS       6    250     655      0     1.098175  14.7806    0.0000     1.098175  1.26e-01  2.86e-01  5.47e+00  9.07e+00   0.0054   6.8588
Bin2+sSOS       8    310     775      0     1.053069  10.0661    0.0088     1.052976  8.62e-02  2.43e-01  4.18e+01  9.32e+01   0.0054  24.1058

Bin2+mSOS       4    310     805    120     1.180700  23.4061    0.0000     1.180700  8.07e-02  1.41e-01  2.49e+01  5.48e+01   0.0022   1.5613
Bin2+mSOS       6    430    1045    180     1.098175  14.7806    0.0092     1.098074  1.26e-01  2.86e-01  5.47e+00  9.07e+00   0.0022   6.8421
Bin2+mSOS       8    550    1285    240     1.053069  10.0661    0.0045     1.053021  8.62e-02  2.43e-01  4.18e+01  9.32e+01   0.0025  16.4817

Bin2+Saw        4    310    1075    120     0.985823   3.0376    0.0000     0.985823  1.08e-01  2.49e-01  1.11e+02  2.44e+02   0.0031   5.4758
Bin2+Saw        6    430    1495    180     0.958677   0.2004    0.0077     0.958603  7.52e-02  1.68e-01  8.94e+01  1.71e+02   0.0035  12.4617
Bin2+Saw        8    550    1915    240     0.956996   0.0247    0.0072     0.956927  7.52e-02  1.68e-01  1.37e+02  2.09e+02   0.0037  46.3848

HybS+sSOS       4    310    1165      0     0.812261  15.1030    0.0000     0.812261  5.52e-01  1.00e+00  2.04e+02  2.97e+02   0.0066   2.4573
HybS+sSOS       6    410    1545      0     0.891208   6.8515    0.0000     0.891208  5.49e-01  1.00e+00  3.69e+02  7.09e+02   0.0068   4.5355
HybS+sSOS       8    510    1925      0     0.934789   2.2965    0.0087     0.934707  5.48e-01  1.00e+00  3.47e+02  5.22e+02   0.0075  14.0315

HybS+mSOS       4    390    1345     80     0.812261  15.1030    0.0046     0.812224  5.52e-01  1.00e+00  2.04e+02  2.97e+02   0.0030   2.6323
HybS+mSOS       6    530    1805    120     0.891208   6.8515    0.0000     0.891208  5.49e-01  1.00e+00  3.69e+02  7.09e+02   0.0035   5.6794
HybS+mSOS       8    670    2265    160     0.934789   2.2965    0.0047     0.934744  5.48e-01  1.00e+00  3.47e+02  5.22e+02   0.0038  14.6266

HybS+Saw        4    390    1525     80     0.951869   0.5113    0.0021     0.951849  5.48e-01  1.00e+00  2.16e+03  4.23e+03   0.0037  12.2289

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