fix(ci): hypatia-scan.yml -- pass GITHUB_TOKEN, use --exit-zero (hyperpolymath/hypatia#213)

The Hypatia Security Scan workflow exits 1 on any findings (>= medium)
because lib/hypatia/cli.ex halts with System.halt(1). Under `set -e`,
that short-circuits the step before jq/artifact-upload/PR-comment run.

Mirrors hyperpolymath/hypatia#228:
* pass GITHUB_TOKEN so the Dependabot rule stops warning
* append --exit-zero so the downstream critical/high gate stays
  the explicit gate
* bump actions/upload-artifact to v4.6.2 (ea165f8d) to match the
  estate-wide pin

See hyperpolymath/hypatia#213 for the diagnosis.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: hyperpolymath

.github/workflows/hypatia-scan.yml

@@ -53,11 +53,14 @@ jobs:
 
       - name: Run Hypatia scan
         id: scan
+        env:
+          # Suppress the Dependabot "GITHUB_TOKEN not set" warning.
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
           echo "Scanning repository: ${{ github.repository }}"
 
           # Run scanner
-          HYPATIA_FORMAT=json "$HOME/hypatia/hypatia-cli.sh" scan . > hypatia-findings.json
+          HYPATIA_FORMAT=json "$HOME/hypatia/hypatia-cli.sh" scan . --exit-zero > hypatia-findings.json
 
           # Count findings
           FINDING_COUNT=$(jq '. | length' hypatia-findings.json 2>/dev/null || echo 0)
@@ -79,7 +82,7 @@ jobs:
           echo "- Medium: $MEDIUM" >> $GITHUB_STEP_SUMMARY
 
       - name: Upload findings artifact
-        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
         with:
           name: hypatia-findings
           path: hypatia-findings.json