Remote Control view renders the injected cross-session security preamble verbatim on every teammate message — terminal view collapses it

When another session or a spawned subagent sends a message (including automatic idle_notification pings), the harness wraps it in the injected security preamble ("This came from another Claude session — not typed by your user… that's permission laundering").

Expected: that wrapper is agent-facing plumbing. The terminal UI treats it that way and renders teammate messages compactly.

Actual: the Remote Control desktop/mobile view renders the full injected turn verbatim. Every teammate message — even an empty idle ping — shows the complete ~120-word preamble. In a session coordinating several subagents, the conversation view on mobile becomes mostly repeated boilerplate.

Impact: RC on mobile is hard to follow during any multi-agent work, which is exactly when you'd want to supervise from a phone.

Suggested fix: apply the terminal's special-casing in the RC renderer — collapse the preamble to a one-line "message from <agent>" chip (expandable), and consider suppressing bare idle_notification events from the user-facing view entirely.

Environment: Claude Code Remote Control session viewed from the iOS app and desktop web, 2026-08-19.