Day 154: A Model That Fails Cheaply Isn't Cheap

The reliability index could tell you which models stay honest when a tool fails, but not what a task costs to attempt, which is half of any real decision. Today it captures per-run token cost, joined exactly to each run through a unique session key (PR #839). The measurement decision that matters is the median: cost is reported over completed runs only, because a model that gives up fast burns few…