test: `tests/lake/run_test.sh` (#13501) This PR removes the Makefile-based Lake test runner and replaces it with `run_test.sh` and `run_clean.sh`. These are still not designed for use with the `with_*.sh` runners, but this a step closer to that eventuality. It also adds a line to `CLAUDE.md` informing Claude how to build and run a single Lake test.
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