Add DUSK_TRACK_MEMORY allocation tracker and memoryCheckUnfreed report

memoryAllocate() becomes a macro capturing __FILE__/__LINE__ into a
fixed-size tracking table when DUSK_TRACK_MEMORY is enabled (Linux only
for now), so a leak surviving to shutdown can be traced back to its call
site. Replaces engineDispose's hard assertTrue with memoryCheckUnfreed(),
which reports unfreed allocations (with call sites when tracking is on,
just a count otherwise) instead of aborting.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

cmake/targets/linux.cmake

@@ -28,6 +28,17 @@ target_link_libraries(${DUSK_LIBRARY_TARGET_NAME} PUBLIC
 
 set(DUSK_BACKTRACE ON CACHE BOOL "Enable backtrace support for assert failures.")
 
+# Records the file/line of every memoryAllocate() call into a fixed-size
+# tracking table (removed again on memoryFree()) so a leak still present at
+# engineDispose()'s memoryGetAllocatedCount() check can be traced back to
+# where it was allocated. Linux only for now.
+set(DUSK_TRACK_MEMORY OFF CACHE BOOL "Track memoryAllocate() call sites to help find memory leaks.")
+if(DUSK_TRACK_MEMORY)
+  target_compile_definitions(${DUSK_LIBRARY_TARGET_NAME} PUBLIC
+    DUSK_TRACK_MEMORY
+  )
+endif()
+
 # Define platform-specific macros.
 target_compile_definitions(${DUSK_LIBRARY_TARGET_NAME} PUBLIC
   DUSK_SDL2
@@ -45,4 +56,5 @@ target_compile_definitions(${DUSK_LIBRARY_TARGET_NAME} PUBLIC
   DUSK_TIME_DYNAMIC
   DUSK_NETWORK_IPV6
   DUSK_THREAD_PTHREAD
+  DUSK_TRACK_MEMORY
 )