Claude Code shows inline suggestions after the prompt when idle (e.g.
"❯ check CI status on the PR"). Also strip separator lines (─) from
terminal output before detection. Use status bar "esc to interrupt"
presence as the authoritative active-vs-idle signal.
- Strip separator lines and empty lines alongside status bar lines
- Check raw output for "esc to interrupt" before stripping
- Treat ❯ + text as idle when status bar lacks esc to interrupt
- 4 new tests covering suggestion detection edge cases
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