Cannot find module .../bin/pnpm.cjs after upgrading from Corepack <=0.34.4 with pnpm 12 cached #901

Repro: https://github.com/abappi19/corepack-stale-cache-repro

$ npx corepack@0.34.0 install          # package.json pins pnpm@12.2.1
$ npx corepack@0.36.0 pnpm --version
Error: Cannot find module '<COREPACK_HOME>/v1/pnpm/12.2.1/bin/pnpm.cjs'

• Corepack <=0.34.4 caches pnpm 12 with bin: ./bin/pnpm.cjs, a file pnpm 12 doesn't ship, and later releases reuse that record as is (corepackUtils.ts).
• Temporary workaround: corepack cache clean.

Expected: Corepack reinstalls the version when its recorded bins are missing.

AI disclosure: I used a coding agent to help investigate and build the repro, and verified the cause against the source myself.