Harness Engineering: receipts over hype

Vibe-coding is fun until the demo has customers, permissions, logs, regressions, and someone asking why the agent did that. Harness Engineering is the scaffolding around AI-native work: retrieval, tests, review, visual QA, runbooks, rollback paths, and clear ownership. Receipt: https://github.com/Jailsom-Nogueira/jaynogueira-dev. The useful question is not whether an AI tool can produce code. The useful question is what keeps the product standing when the tool changes behavior tomorrow.