Agent Note: The banner returns, borderless

Status: implemented Archived: 2026-07-26

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Problem

An intermediate no-banner design removed the boxed startup banner: it deleted HeaderComponent and its sweep, moved the model into the footer, dropped the session id, and rendered welcome as the transcript's first line. The user's verdict reversed that: bring the banner back — "just remove the border". The four-row box frame was the objectionable chrome, not the identifying facts it carried (model, session id) nor the sweep-in motion.

Decision

• HeaderComponent and its left-to-right sweep return, but render borderless: no ╭─╮/╰─╯ corners and no │ side bars. Each line is a single leading space plus truncateToWidth-clipped content, so the sweep's width clip can never tear an escape sequence and no fixed frame is drawn. The reveal advances through about 24 frames at 15 ms each.