Run #1854 failed in `pnpm install --frozen-lockfile`: matrix-js-sdk is a git dependency (upstream pins matrix-org/matrix-js-sdk#develop) that pnpm must build from source, and that source's devEngines pins pnpm 11.9.0. Under `corepack enable` the nested `pnpm install` runs the 11.21.0 shim, which refuses to switch versions ("pnpm does not switch versions when running under corepack") and the prepare step aborts. Reproduced locally with a fresh store; with a real pnpm binary the nested install downloads 11.9.0 itself and succeeds. Both jobs now `npm install -g pnpm@<version>` with the version read from package.json's packageManager field. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA