- branch() and navigateTree() now return the selected user message's image
parts (selectedImages/editorImages) alongside the text, extracted in marker
order by #extractUserMessageImages.
- CustomEditor.setDraft() replaces the composer draft with text plus its
pending images, so restored [Image #N] markers resolve on resubmit instead
of degrading to literal text.
- Wired all six restore call sites (selector-controller, extension-ui-controller)
through setDraft; updated rpc-subagents mocks for the new branch shape.
- Added offline regression tests for branch/navigateTree image restitution,
multi-image marker order, and text-only prompts.
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