fix(ci): hypatia-scan workdir (${{ env.HOME }} resolves empty) (#22)

`hypatia-scan.yml` Build step used `working-directory: \${{ env.HOME
}}/hypatia`; `env.HOME` is not a workflow env var so it resolved to
`/hypatia` and the job hard-failed. Pinned to `/home/runner/hypatia`
(GitHub ubuntu runner HOME). Unblocks the Hypatia Neurosymbolic Analysis
check estate-wide.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Jonathan D.A. Jewell <67598845+hyperpolymath@users.noreply.github.com>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: 3 people

.github/workflows/hypatia-scan.yml

@@ -37,7 +37,7 @@ jobs:
           fi
 
       - name: Build Hypatia scanner (if needed)
-        working-directory: ${{ env.HOME }}/hypatia
+        working-directory: /home/runner/hypatia
         run: |
           if [ ! -f hypatia-v2 ]; then
             echo "Building hypatia-v2 scanner..."