Remote Control: Only one active session per terminal window (splits not supported)

When running multiple Claude Code instances in split panes within the same terminal window (Ghostty), only one Remote Control session appears in the Claude app on mobile.

Steps to reproduce

1. Open a Ghostty terminal window
2. Create a split pane (2 panes in the same window)
3. Run claude in each pane (separate instances)
4. Run /rc in both instances
5. Check the Claude app — only 1 session is visible

Expected

Both RC sessions appear in the Claude app, since each split is an independent terminal/PTY.

Actual

Only 1 RC session is visible per Ghostty window.

Workaround

Using separate terminal windows (not splits) works — each window gets its own RC session.

Environment

• macOS (Darwin 25.4.0)
• Ghostty terminal
• Claude Code (latest)