Run existing tests in the deploy workflows for Pipe Notch and PDF Master

[YurMil]

Both repos have a passing test suite that runs on pull requests but not on the workflow that builds and publishes to the site — so a regression merged to main still deploys.

• YurMil/Pipe-notch-generator — 31 tests, deploy.yml runs build only
• YurMil/pdfs-master — 22 tests, deploy.yml runs build only

For comparison, Blind Flange, Tube Sheet and Dished End all run their tests before building in the deploy path.

Acceptance criteria:

• npm test / pnpm test runs before the build step in both deploy workflows
• A deliberately failing test blocks the deploy (verified once)

Found while writing the QA strategy page (#105).

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