My Claude Code status line races a tortoise against a hare to show whether I'm burning quota faster than a steady pace. Last time I switched the main bar to the 7-day window. I'd kept Fable away from long-running agents — it goes through tokens fast. Then Fable 5.1 landed. The announcement said it's "more comfortable with long, unattended work than Fable 5," and estimated it would cost about 25% less than Fable 5 for typical workloads — up to about 45% less for highly agentic work. I want...