6e08a9f253
Adds §12 documenting the Round 3 follow-up work that re-applied the Round 2 macro-replay engine after the v5.3 driver-manager rebase rolled it back. Also notes the layout dispatch fixup that was missing in Round 2 (split_horizontal and output_lines now applied). Tests: 1486 TLC + 43 cookbook tests pass. No regression. Refs: MC-PARITY-AUDIT.md §12 (Round 3 status)