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## Why Large command streams, including commands that never emit a newline, can make an active TUI cell grow without bound. ## What changed - Retain live output in full up to 1 MiB, then preserve the first and last 50 completed lines plus the current partial line. - Bound individual long lines while preserving UTF-8 boundaries, visible head and tail content, and ANSI rendering around omission markers. - Show omitted line and byte counts in previews and transcripts. Final command output still replaces the bounded live preview when execution completes. ## Testing Added unit and snapshot coverage for chunk boundaries, split CRLF sequences, newline-free and UTF-8 output, truncated ANSI sequences, retained-output limits, and preview and transcript rendering. GitOrigin-RevId: 3cf3cc862db686f20ac09b1f6e7f9dc6d264e6eb