runaway-guard — $-Cost is the Third Complexity Dimension
Every loop has time complexity and space complexity. A loop that calls a paid API has a third: dollars per execution. The model tracks the first two automatically. It does not track the third, so it ships code where a single bug — a retry without bound, a stream reconnect storm, an agent that re-queues itself, a webhook that fires the same job twice — silently spends real money.
The canonical incident: developer writes a Fal.ai ima
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