POST /api/conversation/upload takes an image (via process_image) or a
PDF/txt/md/csv file, checks the conversation belongs to the caller, and
stores files at conversations/<id>/files/<uuid>.<ext> with the original
name in S3 metadata. Anything else gets a 415.
stream-query accepts file_key (must sit under this conversation's
files/ prefix), extracts its text capped at 12k chars, appends it to the
agent's user turn as <attached file> and records 📎 name on the saved
message.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
ryan
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