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When a composition had zero duration (empty GSAP timeline, no data-duration), Docker render hung for 45s then showed the misleading hint "Check Docker is running" even though Docker was fine. Now detects the __hf-not-ready error and suggests adding data-duration or GSAP tweens instead. Reproducer: # Create composition with empty timeline and no data-duration npx hyperframes render --docker --output out.mp4 # Was: "Check Docker is running: docker info" # Now: "Composition may have zero duration. Add data-duration..."