Replace _history_lines (pre-rendered) with _blocks (source + kind) so
_repaint_screen can re-render every chip, banner, user panel at the
current width. \x1b[3J wipes scrollback on resize/Ctrl+L so the entire
conversation reflows, not just the visible viewport.
SIGWINCH delivery via self-pipe + select() — PEP 475 auto-retry on
os.read makes signal-driven InterruptedError unreliable under iTerm
split panes, so a dedicated pipe wakes the loop deterministically.
Streaming tracks a single _streaming_block whose source grows monotonically
through safe-position commits; mid-stream resize re-renders both the
committed source and the volatile live_tail.
Yanis
6c55e260cc
