Chamfer v0.2.1

• Plan-first workflow enables evidence-checked, multi-component design before building.
• Text and image prompts now share one reference-guided CAD workflow.
• Retrieval-backed build123d docs help the agent find APIs and recover from modeling errors.
• Progressive skill loading brings in nine focused modeling and recovery guides only when needed.
• Enhanced visual checks compare the current model against every active reference image.
• Context compaction preserves requirements, plans, and verification state across long runs.
• Kernel-enforced checks block incomplete or weakened self-verification.
• Chat and viewer upgrades add queued prompts, stop controls, live status, auto-rotate, live parameters, and clearer verification history.
• Result: Chamfer can ingest text or images, plan and execute long-running builds, retrieve needed knowledge, and self-verify before finalizing.
• Latest demo: espresso machine from a product image.