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Document the v1 diagnostics story for common template, derive, form, result-handler, and runtime/deploy mistakes. The guide names expected user-facing diagnostics and recurring verification gates without exposing raw ids/selectors as the beginner path. req: diagnostics/001 req: diagnostics/002 req: diagnostics/003 req: failure/004 req: failure/005 req: public_api/005 req: test/003