chore(ci): convert hypatia-scan.yml to wrapper of standards reusable (#13)

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

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.

* chore(ci): retarget hypatia-scan wrapper to standards#193 HEAD

Standards #191 was closed in favour of #193 (parallel-session implementation
with simpler API: zero inputs except runs-on). Repointing the wrapper at
#193 HEAD 97df762107501909f50bb770e9bc200b6c415600 so it picks up the merged reusable once #193 lands.

Refs standards#193.

Author: hyperpolymath