chore: cache-get Make target

[Kha]

No description provided.

[Kha]

We could somehow error if USE_LAKE_CACHE is off

[mathlib-lean-pr-testing]

Mathlib CI status (docs):

• ❗ Batteries/Mathlib CI will not be attempted unless your PR branches off the nightly-with-mathlib branch. Try git rebase 82bb27fd7d9e339419483710ed0fe21c9f7ad3f4 --onto 4f6bcc5adac8d6234a9e3def3675402cb89823c6. You can force Mathlib CI using the force-mathlib-ci label. (2026-04-09 08:51:06)

[leanprover-bot]

Reference manual CI status:

• ❗ Reference manual CI will not be attempted unless your PR branches off the nightly-with-manual branch. Try git rebase 82bb27fd7d9e339419483710ed0fe21c9f7ad3f4 --onto 861bc19e0c1c45b5766cc5c9ef0488568368b236. You can force reference manual CI using the force-manual-ci label. (2026-04-09 08:51:08)