Remote Control: messages sent from phone do not arrive in CLI (one-way communication)

Bug Report

Environment

• CLI version: 2.1.90
• Auth: claude.ai Max plan
• OS: macOS Darwin 25.3.0 (Apple Silicon)
• Phone: iPhone (Claude Code mobile app)

Steps to Reproduce

1. Run /remote-control in CLI terminal
2. Scan QR code on iPhone Claude Code app
3. Select the session (e.g., "remote-control-glowing-teapot")
4. Conversation from CLI is visible on phone ✅
5. Type and send a message from phone
6. Message never appears in CLI ❌

Expected Behavior

Messages sent from the phone should appear in the CLI session and be processed.

Actual Behavior

One-way communication only. CLI → Phone works (conversation visible). Phone → CLI does not work (messages are lost/never delivered).

Troubleshooting Attempted

• Re-scanned QR code — same result
• Closed and re-selected the session — same result
• Restarted /remote-control with new QR — same result
• Verified no blocking env vars (CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC, etc.) — all unset
• Auth is full-scope claude.ai (not API key)

Screenshot

Phone shows the session list with multiple idle remote-control sessions. The selected session displays the conversation correctly but input is not transmitted upstream.