Summary

• forward uploaded chat images to Codex and send them to the Codex SDK as structured local_image inputs
• switch Gemini chat attachments from plain file-path notes to @path references so Gemini CLI reads them as multimodal inputs
• harden temporary attachment filenames and add Windows-focused path/file-name tests for shared image handling

Testing

• npm run typecheck
• node --test test/image-attachment-files.test.mjs
• node --check server/claude-sdk.js
• node --check server/gemini-cli.js
• node --check server/openai-codex.js