Fix CI build (26.x) by removing conflicting pnpm setup

[Copilot]

The build (26.x) GitHub Actions job fails before dependency install because pnpm is configured from two sources with different versions. pnpm/action-setup now hard-fails when the workflow version input and package.json#packageManager disagree.

• Root cause

  • Workflow defined pnpm twice:
    • explicit pnpm/action-setup in .github/workflows/action.yml (version: 11)
    • composite module-cache flow deriving version from package.json (pnpm@11.5.2)

• Change

  • Removed the explicit Setup pnpm step from the build job in .github/workflows/action.yml.
  • Kept pnpm initialization centralized in ./.github/module-cache/action.yaml (single source of truth from packageManager).

• Resulting workflow shape

  • Build job now performs checkout, then calls ./.github/build-artifacts, which internally sets up pnpm via module-cache.

# .github/workflows/action.yml (build job)
steps:
  - uses: actions/checkout@v6.0.3
  - name: Setup Node, install dependencies, and cache node modules, build dist artifacts
    uses: ./.github/build-artifacts
    with:
      node-version: ${{ matrix.node }}

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Latest commit:	68aba6b
Status:	🚫  Build failed.

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