The PATCH /api/projects/:id route handler now reads central.getProject before attempting updates/assignments. The CentralCore mock in node-routes.test.ts didn't include that method, so the route threw and returned 500 instead of 200. Add the stub. Fixes 2 failing tests in node-routes.test.ts (assigns/unassigns nodeId PATCH cases). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>