- Sanitized task subagent progress, fallback output, retry/error text, and yield previews before rendering in the parent TUI.
- Added regression coverage for carriage-return and CSI bytes in expanded subagent output.
Fixes#5159
- Capped nested subagent trees at the per-level limit to prevent unbounded progress rendering in deep sessions.
- Added elision indicators for collapsed nested subagent rows, prioritizing failed tasks during selection.
- Removed the partial-result spinner repaint loop to reduce CPU usage during high-frequency progress streaming.
Reused output notice stripping for task live progress and rendered recent subagent output through the viewport-sized preview budget.
Added regression coverage for fixed six-line capping and raw bash footer leakage.
Fixes#4162
can1357