Task 4.8: Run Security Audit & Document Exceptions

**Phase:** 4 - Risk Mitigation (High Priority)

**Tags:** security

**Description:**
Run `npm audit` and fix any vulnerabilities. Create/update `SECURITY.md` to document known security exceptions.

**Acceptance Criteria:**
- [ ] Run `npm audit`
- [ ] Fix any vulnerabilities
- [ ] Create/update `SECURITY.md` to document known security exceptions