Expand description
attachments.ingest / attachments.cancel / attachments.info — image
attachments in the agent composer
(docs/specs/SPEC_AGENT_PANE_IMAGE_ATTACHMENTS_2026_09_26.md §6). The work
itself lives in backend::attachments; these only adapt it to the RPC
engine. Typed registration, so frontend/types/rpc/ gets the bindings.