diff --git a/campaign/board.md b/campaign/board.md
index 5b1c284..f0731d2 100644
--- a/campaign/board.md
+++ b/campaign/board.md
@@ -47,3 +47,4 @@ Status flow: `backlog → in-progress → mapped → verified` (or `blocked`).
 | engine: game/data catalogs | engine | in-progress | — | 0% | 2026-09-07 | typed WeaponDef/ShipSectionDef/TechTree/IdRegistry on mars/parse+text; oracle = data-catalogs JSON |
 | engine: mars/vfs (gob) | engine | in-progress | — | 0% | 2026-09-07 | ZIP reader + native override; oracle = unzip listings |
 | determinism oracle | verify | in-progress | — | 0% | 2026-09-07 | load same save -> End Turn -> byte-compare autosaves across runs (VM) |
+| engine: shim trace/compare emitter | engine | in-progress | — | 0% | 2026-09-07 | C++ port of harness emit_record/esc/fmt_num + hook modes + snapshot/diff; validated by tracecmp.py exit codes |