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prove-it-works

Check the real result: run the failing path, read the stored value, inspect the diff, or capture the journey. Proxies and 'it compiles' are not proof.

When: Before declaring done, opening a PR, or reporting a fix.

Why: Unverified work has unknown correctness. Indirect signals feel cheap and hide the failure.

Do not: Treat green unit tests alone as proof that a user-visible defect is gone.

Cite this principle by id when it changed a decision. Keep the citation specific.