ci: harden trusted publish workflow

[JoviDeCroock]

Summary

• Explicitly disables setup-node package-manager auto-caching in the trusted publishing workflow.
• Removes existing publish-workflow dependency cache usage where present.
• Pins external GitHub Actions in the trusted publish workflow to full commit SHAs, keeping the original tag as a comment breadcrumb.

Why

Trusted publishing/OIDC workflows should not restore shared dependency caches, and tag-based action references can be retargeted after compromise. The StepSecurity advisory for actions-cool/issues-helper is the concrete failure mode: tags were moved to an imposter commit, while full-SHA pinned workflows were unaffected.

Verification

• Parsed the edited workflow YAML locally with PyYAML.
• Re-scanned release workflows for actions/setup-node without package-manager-cache: false and for actions/cache usage.
• Re-scanned trusted publish workflow uses: entries and confirmed all external actions are pinned to 40-character commit SHAs.

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Latest commit: a661c16

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