Same-state transition was 500 (transition_to_busy asserts current=IDLE). Now: short-circuit identical target → 200 no_change=true. Any other state-machine violation surfaces as 409 with the actual error message instead of generic 500. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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