chore(ci): convert hypatia-scan.yml to thin wrapper of standards reusable (#27)

Replaces ~416 lines of duplicated Hypatia scan plumbing with a 29-line
wrapper calling hyperpolymath/standards/.github/workflows/hypatia-scan-reusable.yml
at SHA 2569c10e831e293f9dd6580d82a494aca039deee (standards#191 HEAD).

Behaviour-preserving: same triggers, same concurrency group, same
permissions, same secrets passthrough.

Refs standards#191.

Author: hyperpolymath