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Prompt Libraries
By the end of Chapter 10 the triage prompt existed in four versions. Version 1 from Chapter 1 was in production. Version 2 had been blocked for under-escalating. Version 2.1, with better examples, was waiting for a canary, and someone had a local copy with a reworded instruction that was "basically the same". Two services embedded their own copies, and when a ticket was misrouted nobody could say with certainty which text had produced it.
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Executable engineering practice
Subscriber-only Python, Java, TypeScript, and SQL labs in the isolated runner.