The shared base tsconfig had strict off, so null-safety and union narrowing
were not checked. Strict is now on for apps/web with 5 small typing fixes.
check-db.ts and migrate-drafts.js depended on Payload, which is no longer a
dependency, and are removed. CLAUDE.md no longer claims Payload.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>