test(gc): cover every interned string-cache root cell, and trim CLAUDE.md - #7276

No file matched to [/home/runner/work/perry/perry/**/*requirements*.txt,/home/runner/work/perry/perry/**/*requirements*.in,/home/runner/work/perry/perry/**/*constraints*.txt,/home/runner/work/perry/perry/**/*constraints*.in,/home/runner/work/perry/perry/**/pyproject.toml,/home/runner/work/perry/perry/**/uv.lock,/home/runner/work/perry/perry/**/*.py.lock]. The cache will never get invalidated. Make sure you have checked out the target repository and configured the cache-dependency-glob input correctly.