Module user_message 

Public UserMessage and Attachment types plus the internal prepare_user_message pipeline that turns them into a motosan_agent_loop::Message for provider dispatch.

See spec §2 / §3 in docs/superpowers/specs/2026-05-20-capo-v0.6-design.md.

Structs

UserMessage

A user message comprising a text body and zero-or-more attachments.

Enums

Attachment

A user-message attachment. non_exhaustive because future variants (inline-bytes, skill, mention) must not break downstream pattern-match.

AttachmentError

Why prepare_user_message rejected an attachment.

AttachmentErrorKind

Discriminator for AttachmentError. Carried over the wire on UiEvent::AttachmentError so RPC clients can branch programmatically.