Resolved conflict in docs/reference/skill-mapping-matrix.md: kept next's Antigravity row (flat layout per #1614, doc-fixed by #1617) AND kept HEAD's Windsurf row (workflows layout per #1615). Also updated the Structural Facts section counts that the original #1615 PR left stale: '15 skill-bearing runtimes' → '14' (Windsurf no longer skill-bearing), 'Nine runtimes stay flat' → 'Eight', removed windsurf from the 'FLAT (unconfirmed)' row in the loader-verification table.