merge game/design; wire; readme

CMakeLists.txt

@@ -25,6 +25,7 @@ add_subdirectory(src/mars/vfs)     # .gob ZIP reader + native override (lib mars
 add_subdirectory(src/mars/stream)  # Streamable save format + gzip     (lib mars_stream)
 add_subdirectory(src/mars/rng)     # MT19937                            (lib mars_rng)
 add_subdirectory(src/game/data)    # typed catalogs on mars/parse+text  (lib game_data)
+add_subdirectory(src/game/design)  # ship-design rules + derived stats  (lib game_design)
 
 # ---- shim trace/compare infrastructure (host-testable; linked into binkw32) ----
 add_library(shim_trace STATIC
@@ -60,7 +61,7 @@ else()
   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 game_sim mars_vfs mars_stream shim_trace game_data)
+  foreach(_t mars_parse mars_text game_sim mars_vfs mars_stream shim_trace game_data game_design)
     if(EXISTS ${CMAKE_SOURCE_DIR}/tests/${_t}/CMakeLists.txt)
       add_subdirectory(tests/${_t})
     endif()

README.md

@@ -19,6 +19,7 @@ loads) builds, deploys, hooks, and logs from a real game launch. Engine code acc
 - `mars/stream` — the game's self-describing save/serialization format (reader, writer, typed shapes) + gzip; three real saves round-trip byte-identical
 - `mars/rng` — MT19937 with save-state load/store; layout confirmed against real saves
 - `game/data` — typed catalogs (weapons, ship sections, turrets, id registries, tech tree, strings) with cross-reference checks; 229k values agree with the reference
+- `game/design` — ship-design assembly/fit/tech-gating rules and derived stats; validates all 127 stock designs from real saves
 
 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.