RIG-402 feat: implementation

[ArLeyar]

Summary

Pipeline engineer task 20260407-040.

Linear: RIG-402

[ArLeyar]

Code review

No blockers. 1 nit.

1. prev_lines tracking is now dead after switching to \x1b[J — it's still computed and reset on resize but passed to refresh_screen as _prev_lines (ignored). The two assignments can be removed.

werma/engine/src/commands/task/status.rs

Lines 171 to 174 in ec83325

	ui::refresh_screen(&content, prev_lines, current_term_width);
	prev_lines = content.lines().count();

The core approach is correct: \x1b[3J on initial clear and on resize prevents scrollback reflow (the root cause of the double-header), and replacing per-line prev_lines counting with \x1b[J (erase to bottom) handles variable-length renders more robustly regardless of whether the terminal resized between ticks.

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