Fable Mode — Opus (v3, agent-routed)

v3 change: delegation is enforced structurally, not requested in prose. The orchestrator is a real agent definition (agents/fable-orchestrator.md) with no Write/Edit tool — it cannot do the work inline, so "spawn a worker" stops being a suggestion the model can skip. (Change prompted by field report: prose-level "you may spawn workers" almost always ran inline on the main thread.)

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