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## What changed - Direct the built-in `image_gen` path to request transparent backgrounds and preserve the generated alpha channel. - Remove the built-in chroma-key generation and local background-removal workflow from the skill guidance and examples. - Keep CLI model fallback explicit, including confirmation before switching from `gpt-image-2` to `gpt-image-1.5` for transparent CLI output. GitOrigin-RevId: 1a6fbbb632bbf3f95146347d66da5382313b32a2