feat: complete template upgrade - chassis framework, UI library, auth, app-nextjs, OpenAPI, and cookbook
Weeks 1-7 of the template upgrade plan:
- pkg/api: typed HTTPError with sentinels, Wrap/WrapMiddleware, Bind, health probes, OpenAPI schema/param builders
- skeleton/packages: ui (design tokens, components), layout (DashboardShell), auth (AuthProvider, ProtectedRoute), api-client
- skeleton/pkg: httperror, app/handler, app/bind, app/health, auth (JWT/API key middleware)
- components/app-nextjs: Next.js 14 App Router template with dashboard, server actions, auth
- cookbooks/feature-development.md with test and validation scripts
- Handler tests for components, project management, and woodpecker webhook
- 3 rounds of code review fixes applied
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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