My Next.js 16 Auth Passed Every Test. Five Bugs That Only Showed Up When I Wired It Together.

The three-layer model works. Part 1 of this series is the invoice incident that proved it. Part 2 is the proxy.ts matcher gaps that fail silently. Part 3 is the mutation-layer auth check that gets skipped even when everything else looks solid. My kit implements this in Route Handlers rather than Ser

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