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* fix(agent): instruct agents to use download_url for attachments Agents were not aware of the signed vs unsigned URL distinction in attachments, causing failures when trying to read images. Added an Attachments section to the generated CLAUDE.md/AGENTS.md template that tells agents to always use `download_url`. Also increased signed URL expiry from 5 to 30 minutes to better accommodate agent processing time. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * feat(cli): add `multica attachment download` command Adds a dedicated CLI command for downloading attachments by ID. The command fetches attachment metadata from the API (which returns a fresh signed URL), downloads the file, and saves it locally. This eliminates the need for agents to understand signed vs unsigned URLs. Changes: - New `multica attachment download <id>` CLI command - New `GET /api/attachments/{id}` backend endpoint - `DownloadFile` helper on APIClient - Updated CLAUDE.md template to document the command Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * fix(cli): sanitize filename and add download size limit - Use filepath.Base on attachment filename to prevent path traversal - Add 100MB size limit to DownloadFile (matches upload limit) - Include response body in download error messages for debugging Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Devv <devv@Devvs-Mac-mini.local> Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>