Exit message rendering garbled — text concatenates on one line

Description

Every time I exit Claude Code (via /exit), the exit message renders incorrectly. The box-drawing frame, session resume line, and "Exit the REPL" text all collapse onto the same line instead of being properly formatted.

Expected

Resume this session with:
──────────────────────────
claude --resume <session-id>

Exit the REPL

Actual

Resume this session with:────────────────────
claude --resume 20d5b74e-e3fc-405d-8c22-5912ed2b2755Exit the REPL

The box-drawing characters appear on the same line as the "Resume this session with:" text, and "Exit the REPL" is concatenated directly after the session ID with no newline.

Reproduction

1. Start claude in any directory
2. Type /exit
3. Observe garbled output

Happens 100% of the time.

Environment

• macOS (Darwin 25.4.0)
• Terminal: Ghostty
• Custom statusline enabled (verified: disabling it does not fix the issue)
• Hooks configured (Stop, SessionStart, PreToolUse, UserPromptSubmit) — none output to stdout during exit