Steering (submitting mid-stream) dropped any pending composer attachments. Now the
pending files are uploaded before the /steer payload is sent, the uploaded file
paths are appended to the steer text so the active agent can inspect them with
tools, file chips stay staged if the steer fails (so nothing is lost), and
file-only busy submissions are handled.
Contributor stage; gate-pass. Co-authored-by: ruizanthony <ruizanthony@users.noreply.github.com>
nesquena-hermes