pnpm/action-setup@v4 fails outright when a version is given in the workflow
AND package.json carries `packageManager` -- "Multiple versions of pnpm
specified" -- so the first run on this repo never reached the install step.
Dropping the pin leaves one source of truth.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WFLwZtXE6iBJyJSgrsWqRM