ci: fix CLI e2e pnpm matrix failing after packageManager pin

[devin-ai-integration]

What

All 14 pnpm jobs in the CLI e2e matrix have failed since #1067 added "packageManager": "pnpm@10.33.0" to the root package.json. pnpm/action-setup@v6 refuses to run when both its version input and packageManager are set:

Error: Multiple versions of pnpm specified:
  - version 10 in the GitHub Action config with the key "version"
  - version pnpm@10.33.0 in the package.json with the key "packageManager"

Changes

In .github/workflows/cli-e2e.yml (matrix job only):

• Replace the pnpm/action-setup step with npm install --global pnpm@<major>, mirroring how the npm variants are already installed. The matrix intentionally tests pnpm 9/10/11, so it can't honour the repo's packageManager pin.
• Run the "Verify package manager version" step from runner.temp instead of the repo checkout. pnpm ≥10 self-switches to the packageManager version when invoked inside the repo, so pnpm --version there reported 10.33.0 even with pnpm 11 installed. All subsequent steps already run in runner.temp, so the pin never applies to the generated app.

Test Plan

• Not applicable (explain why)
• Verified locally — CI on this PR runs the full matrix; all 14 pnpm + 12 npm jobs green.

Checklist

• I linked a related issue, if applicable (chore: unify pnpm version and mark non-publishable manifests private #1067)
• I updated docs/README when needed
• I considered backwards compatibility

Link to Devin session: https://app.devin.ai/sessions/e6ce4156b3a24609b00846430fc39ea0
Open in Devin Desktop: https://app.devin.ai/desktop/session/e6ce4156b3a24609b00846430fc39ea0?variant=devin

[devin-ai-integration]

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Project	Deployment	Actions	Updated
openui-docs	Ready	Preview	Sep 10, 2026 6:39pm UTC