PR history

The product is built as sequential vertical slices, each merged only after the full verification ladder. The complete per-PR record — scope, verification, decisions — lives in EXECUTION_PLAN; the compact summary table is on this site’s Roadmap page.

Numbering note: the UX sequence renumbered once — the original “PR-39 polish” slice shipped as PR-40 because PR-39 was used for the split-view refresh fix.