Migrate netdes harness invocations to generic_cylinders.py

[DLWoodruff]

Summary

• Archive examples/netdes/netdes_ef.py (no callers), netdes_ph.py (no callers), drivertest.py (developer scratch), and netdes_extension.py (only referenced from a commented-out line in netdes_ph.py) under examples/netdes/archive/.
• examples/run_all.py: add a parallel generic_cylinders.py --module-name netdes entry next to the retained netdes_cylinders.py one. --slammax, --cross-scenario-cuts, and the --obbt presolve flags are not wired through generic_cylinders.py, so the new entry uses --subgradient-hub + --xhatshuffle + --presolve instead; the options unique to the custom driver are still covered by the netdes_cylinders.py entry above.
• doc/src/examples.rst: reword the netdes section to say runs go through the generic driver by default and that netdes_cylinders.py is retained as the cross-scen-cuts/slammax worked example.

Retained in place: netdes.py (model module), netdes_cylinders.py (rst-referenced), netdes_with_class.py (rst-referenced + used by generic_tester.py), parse.py (imported by both netdes.py and netdes_with_class.py).

Test plan

• mpiexec -np 2 python -m mpi4py ../../mpisppy/generic_cylinders.py --module-name netdes --max-iterations=3 --instance-name=network-10-20-L-01 --netdes-data-path ./data --rel-gap=0.0 --default-rho=10000 --presolve --subgradient-hub --xhatshuffle --max-solver-threads=2 --solver-name=gurobi_persistent — runs, subgradient hub + xhat spoke terminate cleanly
• ruff check examples/run_all.py
• CI run_all job on this PR

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.70%. Comparing base (b726347) to head (f41dbe0).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #661      +/-   ##
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- Coverage   70.71%   70.70%   -0.02%     
==========================================
  Files         153      153              
  Lines       19005    19005              
==========================================
- Hits        13439    13437       -2     
- Misses       5566     5568       +2     

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