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

The `hypatia-scan.yml` wrapper landed in #66 pinned to
`97df762107501909f50bb770e9bc200b6c415600` — the SHA of the
hypatia-scan-reusable.yml commit on standards#193's feature branch.

After standards#193 was squash-merged into standards/main on 2026-05-26,
that feature-branch commit was orphaned (`gh api repos/.../compare/main...97df762`
reports `status: diverged, ahead_by: 1, behind_by: 24`).  GitHub
Actions cannot resolve reusable-workflow references to orphaned
commits, so every hypatia-scan run since #73 merged has failed at the
workflow-parse stage with "This run likely failed because of a
workflow file issue" — the run JSON shows `jobs: []` because no job
is ever instantiated.

The required check `Hypatia Neurosymbolic Analysis` (per branch
protection on main) is therefore never produced, blocking every PR
including #72 (proof-debt items 1-8) and #74 (items 7+8 deepening).

Repin to `915139d73560e65a8240b8fc7768698658502c89`, the actual
merge-commit SHA on standards/main.  File content at this SHA is
byte-identical to the orphan (`diff -q` returns empty), but the
commit is reachable from standards/main, so the GitHub Actions
runner can resolve it and the workflow's `scan` job actually
instantiates.

Estate impact: ~250+ repos across hyperpolymath/* pin the same
orphaned SHA (verified via `gh search code "@97df762"`).  This is a
typed-wasm-local fix; standards-side closure of the estate-wide
sweep is upstream work tracked separately under the reusables
campaign (standards#215 closure doc, hypatia#336-339 detection
issues).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

.github/workflows/hypatia-scan.yml

@@ -25,5 +25,5 @@ permissions:
 
 jobs:
   hypatia:
-    uses: hyperpolymath/standards/.github/workflows/hypatia-scan-reusable.yml@97df762107501909f50bb770e9bc200b6c415600
+    uses: hyperpolymath/standards/.github/workflows/hypatia-scan-reusable.yml@915139d73560e65a8240b8fc7768698658502c89
     secrets: inherit