diff --git a/CMakeLists.txt b/CMakeLists.txt
index 04c313b..29f3dee 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -17,6 +17,10 @@ string(REGEX REPLACE "^// " "" SOTS_ADDR_PROVENANCE "${_addr_provenance}")
 add_library(sots_addresses INTERFACE)
 target_include_directories(sots_addresses INTERFACE ${CMAKE_SOURCE_DIR}/include)
 
+# ---- engine modules (host + cross): pure, oracle-verified code accrues here ----
+add_subdirectory(src/mars/parse)   # brace-block + .effect readers   (lib mars_parse)
+add_subdirectory(src/mars/text)    # flat-kv, id-manifest, csv       (lib mars_text)
+
 if(WIN32)
   # ---- shim: proxy binkw32.dll that the original game loads (Phase 2 frontend) ----
   add_library(minhook STATIC
@@ -34,9 +38,14 @@ if(WIN32)
   # Must be exactly binkw32.dll (no "lib" prefix); export names come solely from the .def.
   set_target_properties(binkw32 PROPERTIES PREFIX "" OUTPUT_NAME "binkw32")
 else()
-  # ---- host: nothing to build yet; keep the preset alive with a header smoke test ----
+  # ---- host: engine module tests (ctest) + a header smoke test ----
   enable_testing()
   add_executable(addr_smoke tests/addr_smoke.cpp)
   target_link_libraries(addr_smoke PRIVATE sots_addresses)
   add_test(NAME addr_smoke COMMAND addr_smoke)
+  foreach(_t mars_parse mars_text)
+    if(EXISTS ${CMAKE_SOURCE_DIR}/tests/${_t}/CMakeLists.txt)
+      add_subdirectory(tests/${_t})
+    endif()
+  endforeach()
 endif()
diff --git a/README.md b/README.md
index 453b290..6d054f5 100644
--- a/README.md
+++ b/README.md
@@ -9,9 +9,14 @@ the original binaries are never included; tests and tools read an owner-supplied
 `$SOTS_DATA_DIR`. See `CONTRIBUTING.md` for the clean-room rules.
 
 ## Status
-Phase 2 / M0 — the shim frontend (`src/shim/`): a proxy DLL the original game loads, used to
-verify each reimplemented function against the original before it displaces it. Engine code
-accrues under `src/mars/` (engine) and `src/game/` (game logic) as milestones land.
+Phase 2. **M0 done** — the shim frontend (`src/shim/`, a proxy `binkw32.dll` the original game
+loads) builds, deploys, hooks, and logs from a real game launch. Engine code accrues under
+`src/mars/` and `src/game/`; each module is oracle-verified against the owner's game data before merge:
+- `mars/parse` — brace-block + `.effect` readers (1,531/1,531 files agree with the reference)
+- `mars/text` — flat key/value tables, id manifests, CSV (64/64 files agree)
+
+Build: `cmake --preset host && cmake --build --preset host && ctest --preset host` (Linux);
+`tools/sync-build.sh` cross-builds the shim on the lab box and stages it for deployment.
 
 ## Layout (grows with the work)
 - `src/shim/` — binkw32 proxy + hooks + old-vs-new compare harness (frontend #1)