Recorded logs carried the raw stream: SGR colors, cursor moves,
synchronized-output markers, and every TUI redraw frame — unreadable in an
editor and far larger than the visible output (a short kimi session logged
21.5KB of which 4.4KB is text). A per-session sanitizer now strips ANSI
statefully across chunk boundaries, collapses carriage-return overwrites
(progress bars keep only their final text), and suppresses alternate-screen
frames with a marker line. Ink-style inline TUIs redraw in the normal
buffer and cannot be frame-collapsed without screen emulation; their
committed lines are preserved.
