Wire on_file into the Mac app: received files save to ~/Downloads; images show
an inline preview in the feed, other files show a doc chip with a reveal-in-
Finder button. A paperclip in the composer opens a file picker → send_file
(mime inferred from extension). FeedItem gains optional image/fileURL.
Add `tether-agent send-file <path>` (one-shot share / test helper).
Verified live: an agent sent a 36KB PNG over RTC and it rendered inline in the
Mac app's feed.
Follow-up: iOS file UI (mirror), clipboard-image auto-send, transfer progress.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Patrick Ecord
b2a1e06f56
