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Joe Savona
47172f064f
## Why UI tree limits previously applied during rendering, silently dropping content beyond the budgets. Validate the whole JSON tree before rendering so oversized inputs are rejected, including content outside the visible line. ## What changed - Add a `UiTree` string parser that limits JSON to 64 KiB, nesting depth to 16, non-null nodes to 256, and total string content to 16 KiB of UTF-8. - Represent text as string leaves or `text` elements with children. Remove node keys, `spacer`, and `divider` elements. - Require an explicit `row` gap as a non-negative JavaScript-safe integer measured in terminal columns. Bound rendered spacing by the viewport and skip empty children when inserting gaps. - Update footer content and built-in status lines to use the revised tree format. ## Testing Add coverage for malformed elements and gaps, whole-tree size boundaries, URL length limits, large-gap rendering, and bounded UTF-8 prefixes for directly constructed text. Update hyperlink and footer clipping tests for the new format. GitOrigin-RevId: 3c00881d3e7f2d79d11aa188f64f0725cd47ee68