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Refactor buffer trimming logic to use dynamic line counts (_lines per entry) against PAD_SIZE (10k) instead of fixed entry count (MAX_BUFFER_SIZE=200). This prevents premature cleanups for short messages, reduces scrolling disruptions during history loads, and scales better with rendered content size. Delete oldest/newest entry from opposite end only when total lines approach ncurses pad limit, minimizing unnecessary deletions. Simplify overflow warning log by removing unused MAX_BUFFER_SIZE reference. Update buffer.c header for improved DX: - Add detailed module overview explaining role (in-memory UI buffer vs. DB persistence), key features (trimming, metadata), and integration (ncurses). - Shorten copyright/license boilerplate to concise pointer (LICENSE ref). - Add fork notice; preserve original copyrights per GPLv3. Partially addresses #36 (stuck scroll mitigation via fewer cleanups) Related to #36