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10b0399034
## Why The standalone `image_gen.imagegen` extension should behave like native image generation for artifact persistence and UI completion, while returning its save-location guidance as part of the tool result instead of injecting a developer message. ## What Changed - Added an image-generation completion hook for extension tools so core can persist generated images and emit the existing `ImageGeneration` lifecycle events. - Reused core image artifact persistence for extension output and removed extension-local save-path/file-writing logic. - Split shared image persistence from built-in finalization so native image generation keeps its existing developer-message instruction behavior. - Returned the generated image save-location instruction through the extension `FunctionCallOutput`, alongside the generated image input for model follow-up. - Preserved the existing image-generation event shape for current UI and replay compatibility. - Avoided cloning the full generated-image base64 payload when emitting the in-progress image item. - Removed dependencies no longer needed after moving persistence out of the extension crate. ## Fast Follow - Adjust the existing Extension API and add a general `TurnItem` finalization path for re-usability of code ## Validation - Ran `just fmt`. - Ran `just bazel-lock-update`. - Ran `just bazel-lock-check`. - Ran `just test -p codex-tools -p codex-extension-api -p codex-image-generation-extension`. - Ran `just test -p codex-core image_generation_publication_is_finalized_by_core`. - Ran `just test -p codex-core handle_output_item_done_records_image_save_history_message`. - Ran `just fix -p codex-tools -p codex-extension-api -p codex-core -p codex-image-generation-extension`.