lean4
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chore: make `Subrelation` reducible
This PR makes Subrelation reducible.
Closes #10471
WIP
Mathlib CI status (docs):
- ❗ Batteries/Mathlib CI will not be attempted unless your PR branches off the
nightly-with-mathlibbranch. Trygit rebase 38b4062edb5f14185df19d702953756f48ceaba0 --onto 4379002d0582ae96d7fc6ccf5921ff4e9aa7239e. You can force Mathlib CI using theforce-mathlib-cilabel. (2025-09-19 21:21:53)
Reference manual CI status:
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nightly-with-manualbranch. Trygit rebase 38b4062edb5f14185df19d702953756f48ceaba0 --onto d3dda9f6d4428a906c096067ecb75e432afc4615. You can force reference manual CI using theforce-manual-cilabel. (2025-09-19 21:21:54)
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