My agent died at lead 1,244 of an overnight run, then re-billed every finished LLM call. Durable execution for AI agents in 150 lines of TypeScript.

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A crashed overnight run re-billed $19 of finished LLM calls and double-sent outreach emails. This is durable execution for AI agents built from scratch: a 150-line event log and step wrapper in TypeScript, the failure modes that survive it, and the point where a workflow engine earns its keep.