Review project against architecture invariants

Review an existing project scaffolded with nextjs-fullstack-starter against the architectural invariants and patterns. Use this whenever the user wants to audit project conventions, asks 'does this follow our patterns', wants a pre-PR architecture check, suspects drift, is onboarding a new contributor, or invokes /nfs-review-project. Runs a mechanical check script for fast objective violations (missing server-only, DB queries in src/app/, missing requirePermission on mutations, missing audit, wrong cache primitives, tRPC imports from the wrong stack), then samples files for judgment calls, then produces a categorized report grouped by severity (must fix / should fix / not…