ci: add npmscan PR dependency scan

[salemalem]

Summary

• add a small npmscan workflow that runs on pull requests touching package.json or pnpm-lock.yaml
• start in mode: warn so the report is visible without changing merge policy
• pin the action to the current v1.3.0 commit and keep fail-on-error: false to avoid blocking merges on scanner outages

Why

This adds PR-time dependency diff review for cases normal vulnerability audits often miss, especially new install scripts, lockfile source changes, and changed overrides/resolutions.

Test plan

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

[netlify]

👷 Deploy request for openapi-ts pending review.

Visit the deploys page to approve it

Name	Link
🔨 Latest commit	ad17827

[changeset-bot]

⚠️ No Changeset found

Latest commit: ad17827

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR