chore: sync rm_set_option with mathlib, fix it on Windows, remove 29 respectTransparency options

[zhikaip]

This PR updates the set_option removal script and runs it across the repo.

Commits

1. chore(scripts): sync rm_set_option.py and set_option_utils.py with mathlib. Brings in mathlib4#41997:

   • The script now leaves a set_option line alone if the line above is a -- comment or ends in -/.
   • backward.isDefEq.respectTransparency.types is added to the default options.

2. fix(scripts): kill timed-out builds on Windows in dag_traversal.py. os.killpg doesn't exist on Windows, so the first per-module timeout crashed the script and left the build running. A new _kill_tree helper falls back to taskkill /F /T. This is a local change to a file copied from mathlib; I plan to send it upstream too.

3. chore: remove unnecessary set_option backward.isDefEq.respectTransparency false. The script's results: 29 lines removed in 8 files.

   File	Removed
   Relativity/PauliMatrices/ToTensor.lean	15
   SpaceAndTime/SpaceTime/Basic.lean	6
   Relativity/Special/TwinParadox/Basic.lean	3
   Electromagnetism/Distributional/Dynamics/IsExtrema.lean	1
   Electromagnetism/Distributional/FieldStrength.lean	1
   Relativity/LorentzGroup/Boosts/Generalized.lean	1
   Relativity/LorentzGroup/Rotations.lean	1
   QuantumInfo/Entropy/VonNeumann.lean	1

No lemmas or definitions are added or removed.

Reviewer map: commits 1 and 2 are small script diffs. Commit 3 only deletes set_option lines and can be skimmed. Of the 659 lines tried across 178 files, 630 are still needed.

🤖 Generated with Claude Code

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[jstoobysmith]

Looks good to me. Approved