ci(hypatia-scan): repin reusable to merge-commit SHA (orphan-SHA fix)

[hyperpolymath]

Summary

The hypatia-scan.yml wrapper pins to 97df762... — the PR-branch commit of standards#193, not its merge commit. After the squash-merge, that PR-branch SHA was orphaned. GitHub Actions can no longer resolve the reusable, so every hypatia-scan run fails at parse stage (jobs: [], banner: "This run likely failed because of a workflow file issue").

Diagnosis

• Old pin: 97df762107501909f50bb770e9bc200b6c415600 — PR-branch commit on standards#193 (orphaned).
• New pin: 915139d73560e65a8240b8fc7768698658502c89 — actual merge-commit on standards/main.

Verification:

$ gh api repos/hyperpolymath/standards/compare/main...97df762
{ "status": "diverged", "ahead_by": 1, "behind_by": 24 }
$ gh api repos/hyperpolymath/standards/compare/main...915139d7
{ "status": "behind", "ahead_by": 0, "behind_by": 1 }

File content at both SHAs is byte-identical; only the reachability differs.

Estate scope

This is one of ~100 PRs in the sweep (gh search code "@97df762" --owner hyperpolymath returned 100 hits). Reusables-campaign closure track. See hyperpolymath/standards#220 for the closure audit doc.

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