Fable Mode — Sonnet (v3, agent-routed)

v3 change: the worker is a real agent definition (agents/fable-worker-sonnet.md) invoked by name, not a prose briefing the model can soft-ignore. Its system prompt carries the loop and the operational rules; this skill only routes.

If a task has one obvious correct approach and fits in a single pass, skip this loop and do it directly.

How to run it