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## Summary - make Virtua the sole prepend geometry/correction owner by accumulating active prepend ResizeObserver corrections from the live DOM offset - retire prepend reconciliation on ordinary reader wheel input, while preserving it for Ctrl+wheel browser zoom - remove Buzz's competing three-second semantic-anchor watcher and corrective `scrollBy` loop - keep ESM/CJS Virtua patch behavior equivalent and update the patch lock hash ## Why Buzz admitted prepended rows using seeded estimates, then Virtua received multiple measurement corrections for the same transaction. Each correction was based on the same stale model offset, so a later write replaced an earlier correction instead of accumulating it. In the reproduced first page, that resurrected 452px of anchor drift; the app-level watcher merely corrected the lost virtualizer write afterward. This fixes the correction inside Virtua and deletes the competing app writer, following the single-owner geometry invariant used by Berd rather than copying its spacer implementation. ## Validation - watcher-off desktop virtualization matrix: 11/11 passed, including 15 cascading prepends, continued wheel input, detached rich-row growth, channel switching, bottom follow, and buffered live arrivals - focused cascading prepend/Ctrl+wheel regression passed - desktop typecheck passed - desktop unit suite passed: 3,495 tests - Biome passed on changed desktop files - `git diff --check` clean ## Manual behavior Load older history repeatedly while scrolling upward, then wheel downward during/after a prepend. The visible anchor should stay within the existing 5px contract during reconciliation, and deliberate reader movement should not be pulled back. Ctrl+wheel during the prepend commit must not cancel reconciliation. --------- Signed-off-by: Wes <wesbillman@users.noreply.github.com> Co-authored-by: Carl <c7ebe626f000404285d3686e1dc74cc07cc60a9754a150041ba132e14bd3e2ec@sprout-oss.stage.blox.sqprod.co> Co-authored-by: Carl <c7ebe626f000404285d3686e1dc74cc07cc60a9754a150041ba132e14bd3e2ec@buzz.block.builderlab.xyz>