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Validation traces every requirement to its implementation and every implementation back to a requirement - gap analysis, the traceability matrix, holdout scenarios the agent never sees, and the two feedback arrows that make the phase more than an audit.
FastEndpoints wires FluentValidation into the pipeline by request-DTO type, runs validators as singletons, and shares one failure list between binder, validator and handler. The lifetime rule is the part that bites. Part 5 of FastEndpoints in Depth.
The platform bundled a client-side validation framework - one file of it twice - and wired none of it, hand-stitching every real check inside modal callbacks with manual error classes and keyup character counters.
