ci: add npmscan PR dependency scan

[salemalem]

Summary

• add a dedicated npmscan workflow for pull requests that touch workspace package.json files, pnpm-lock.yaml, or pnpm-workspace.yaml
• start in mode: warn so maintainers can evaluate the signal before adopting any blocking policy
• pin the action to the current v1.3.0 commit and keep fail-on-error: false so external scanner availability does not block merges

Why

This complements the existing CI with PR-time supply-chain checks for new install scripts, lockfile source or tarball changes, changed overrides/resolutions, and malware advisories that are often outside standard CVE-focused workflows.

Test plan

• Open a PR that changes pnpm-lock.yaml or a workspace package.json
• Confirm the npmscan workflow runs
• Confirm findings are reported in warn mode without failing the PR
• Confirm unrelated PRs do not trigger the workflow

[changeset-bot]

⚠️ No Changeset found

Latest commit: 9e87513

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[pkg-pr-new]

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commit: 9e87513