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md with a Testa proof: the strongest available evidence that the decision actually holds — executable test, contract/schema check, a domain check (a11y/security/reliability/eval), or a reviewer rubric when execution is impossible — and a one-line portfolio claim that names the proof, not the topic.
In the full lesson (~25 minutes) you work the loop on a real scenario and leave with evidence in your ledger — not a completion checkmark.