Stray '>' character appears at prompt line after response completes (still occurring; refile of #34970)

Refiling #34970 — the original was auto-closed by the stale bot, but this is still happening as of 2026-04-14.

Environment

• OS: macOS (Darwin 25.3.0)
• Terminal: iTerm2
• Shell: zsh
• Status line: enabled (bypass permissions on)
• Voice: enabled
• Hooks: Stop hook (session-summary.py, writes to stderr only)

Reproduction

• Happens intermittently after responses complete
• Not tied to specific response content or tool usage
• The > is cosmetic only — typing clears it, input is unaffected
• Observed across multiple sessions and multiple Claude Code versions since March

Expected

Prompt shows only ❯ with cursor.

Actual

Prompt occasionally shows ❯_> with a stray >.

Prior analysis (from #34970)

• $PROMPT is %T: — no > character
• Stop hooks write to stderr/files, not stdout
• No custom keybindings or prompt config
• Likely a TUI rendering artifact from ANSI escapes or status line updates