Adds schema-based input validation across helcim, events, members,
series, admin, and updates API endpoints. Removes the peer-support
debug test endpoint. Adds validation test coverage.
Set up Vitest with server (node) and client (jsdom) test projects.
79 tests across 8 files verify all Phase 0-1 security controls:
escapeHtml sanitization, DOMPurify markdown XSS prevention, CSRF
enforcement, security headers, rate limiting, auth guards, profile
field allowlist, and login anti-enumeration. Updated SECURITY_EVALUATION.md
with remediation status, implementation summary, and automated test
coverage details.
