Watches a new product's first weeks against pre-set early-signal thresholds and a fixed test budget, proposing scale or stop before the spend runs away. Use for the fixed window after a product launch or restock. Boundary: `product-launch-checklist` is the one-time go/no-go checklist run before launch day. This loop runs after launch, on a cadence, for a bounded window, and its gate is early performance rather than readiness.
