Water main break decision-theory example (draft)#45
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A docs example that fits a GP survival model to the City of Kitchener open water main data and uses decision theory per Rasmussen and Williams Ch 2, to turn the predictive distribution into a dollar-valued replace or defer decision.
Not ready to merge because a backtest shows that the model doesn't yet beat a naive "replace what broke before" policy because it ignores each pipe's own break history. Next step is a per-pipe frailty (or a slight reframe) before it's ready.