chore: gate check (authorized security test)

[Cryptojourney]

Authorized HackerOne research: checking whether fork-PR CI requires maintainer approval. Benign, no payload. — Cryptojourney

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Note

Low Risk
Documentation-only addition with no runtime, CI config, or security-sensitive logic changes in the diff.

Overview
Adds a new GATECHECK.md file containing a single line that marks this change as authorized, benign security research to verify whether fork-PR CI runs without maintainer approval.

There are no application, workflow, or infrastructure code changes in the diff—only this documentation-style marker.

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[vercel]

@Cryptojourney is attempting to deploy a commit to the Tools For Humanity Team on Vercel.

A member of the Team first needs to authorize it.