fix: Add permissions to security audit job in CI workflow

The security audit job requires explicit permissions to create check runs.
Add permissions for contents:read, issues:write, and checks:write to fix
the "Resource not accessible by integration" error.

Resolves GitHub Actions error: Resource not accessible by integration

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: jrollin

.github/workflows/ci.yml

@@ -62,6 +62,10 @@ jobs:
     name: Security Audit
     runs-on: ubuntu-latest
     continue-on-error: true
+    permissions:
+      contents: read
+      issues: write
+      checks: write
     steps:
       - name: Checkout code
         uses: actions/checkout@v4