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DEC 2026 synchronized-output wrap + CODEWHALE_TUI_DEBUG=1 #2085

@Hmbown

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@Hmbown

Shape. Wrap ratatui's Backend::flush with DEC 2026 BSU/ESU sequences (\x1b[?2026h / \x1b[?2026l) to eliminate tearing on iTerm2 + ghostty. Add CODEWHALE_TUI_DEBUG=1 that logs per-frame render diffs to ~/.deepseek/logs/tui-render.log. ~70 lines total. Wins independent of any other work in this slate.


Existing issues this resolves on PR merge

Partially addresses:

When opening a PR for this issue, the PR body must include the Closes #N lines for every issue above that this PR fully resolves, so they auto-close on merge.

Slate item 12/18. Tracking doc: .private/issue-slate.md (maintainer-only).

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    autonomous-readyGreenlit for the autonomous nightly loop to pick up, implement, PR, and mergedocumentationImprovements or additions to documentationenhancementNew feature or requestgood first issueGood for newcomersrustPull requests that update rust code

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