fix(build): Add file-level dependencies for assets (shaders, meshes, audio)

CRITICAL FIX: Changing .wgsl/.spec/.obj files now triggers asset regeneration.

Problem: CMake only tracked demo_assets.txt, not individual asset files.
Result: Editing shaders didn't trigger rebuilds → stale code in binary!

Solution: Parse demo_assets.txt to extract all asset filenames and add them
to DEPENDS clause in add_custom_command(). Now CMake tracks all 42 assets.

Implementation:
- Added parse_asset_list() function to extract filenames from asset list
- Regex parses format: ASSET_NAME, COMPRESSION, FILENAME, DESCRIPTION
- Filters out PROC() entries (procedural, no file on disk)
- Adds full paths to DEPENDS for both pack_assets() and pack_test_assets()

Performance impact:
- Before: touch shader → 0.28s (no rebuild, STALE!)
- After:  touch shader → 3.55s (regenerates assets, rebuilds users)

Files tracked: 42 demo assets + 17 test assets
- Shaders: renderer_3d.wgsl, mesh_render.wgsl, skybox.wgsl, etc.
- Audio: kick1.spec, KICK_606.spec, snare samples, bass samples
- Meshes: dodecahedron.obj, other geometry

Developer workflow: No more 'touch demo_assets.txt' workaround needed!
Just edit shaders and rebuild - dependencies work correctly now.

1 files changed, 34 insertions, 3 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index ff47cea..887e018 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -181,15 +181,42 @@ else()
     set(TRACKER_COMPILER_FINAL_DEPENDS ${TRACKER_COMPILER_DEPENDS})
 endif()
 
-#-- - Code Generation Helpers -- - 
+#-- - Code Generation Helpers -- -
+# Helper to parse demo_assets.txt and extract individual file paths
+function(parse_asset_list INPUT_TXT OUT_FILE_LIST)
+    set(ASSET_FILES "")
+    if(EXISTS ${INPUT_TXT})
+        file(STRINGS ${INPUT_TXT} LINES)
+        foreach(LINE ${LINES})
+            # Skip comments and empty lines
+            string(STRIP "${LINE}" LINE)
+            if(NOT LINE MATCHES "^#" AND NOT LINE STREQUAL "")
+                # Extract filename (third field: ASSET_NAME, COMPRESSION, FILENAME, DESC)
+                string(REGEX REPLACE "^[^,]+,[^,]+,[ ]*([^,]+).*" "\\1" FILENAME "${LINE}")
+                string(STRIP "${FILENAME}" FILENAME)
+                # Build full path
+                set(FULL_PATH "${CMAKE_CURRENT_SOURCE_DIR}/assets/final/${FILENAME}")
+                if(EXISTS ${FULL_PATH})
+                    list(APPEND ASSET_FILES ${FULL_PATH})
+                endif()
+            endif()
+        endforeach()
+    endif()
+    set(${OUT_FILE_LIST} ${ASSET_FILES} PARENT_SCOPE)
+endfunction()
+
 function(pack_assets NAME INPUT_TXT HEADER_VAR DATA_CC_VAR TARGET_NAME)
     set(OUT_H ${CMAKE_CURRENT_SOURCE_DIR}/src/generated/${NAME}.h)
     set(OUT_CC ${CMAKE_CURRENT_SOURCE_DIR}/src/generated/${NAME}_data.cc)
+
+    # Parse asset list to get individual file dependencies
+    parse_asset_list(${INPUT_TXT} ASSET_FILE_DEPS)
+
     add_custom_command(
         OUTPUT ${OUT_H} ${OUT_CC}
         COMMAND ${CMAKE_COMMAND} -E make_directory ${CMAKE_CURRENT_SOURCE_DIR}/src/generated
         COMMAND ${ASSET_PACKER_CMD} ${INPUT_TXT} ${OUT_H} ${OUT_CC}
-        DEPENDS ${ASSET_PACKER_DEPENDS} ${INPUT_TXT}
+        DEPENDS ${ASSET_PACKER_DEPENDS} ${INPUT_TXT} ${ASSET_FILE_DEPS}
         COMMENT "Generating assets for ${NAME}..."
     )
     set(${HEADER_VAR} ${OUT_H} PARENT_SCOPE)
@@ -201,11 +228,15 @@ endfunction()
 function(pack_test_assets NAME INPUT_TXT HEADER_VAR DATA_CC_VAR TARGET_NAME)
     set(OUT_H ${CMAKE_CURRENT_BINARY_DIR}/src/generated_test/${NAME}.h)
     set(OUT_CC ${CMAKE_CURRENT_BINARY_DIR}/src/generated_test/${NAME}_data.cc)
+
+    # Parse asset list to get individual file dependencies
+    parse_asset_list(${INPUT_TXT} ASSET_FILE_DEPS)
+
     add_custom_command(
         OUTPUT ${OUT_H} ${OUT_CC}
         COMMAND ${CMAKE_COMMAND} -E make_directory ${CMAKE_CURRENT_BINARY_DIR}/src/generated_test
         COMMAND ${ASSET_PACKER_CMD} ${INPUT_TXT} ${OUT_H} ${OUT_CC}
-        DEPENDS ${ASSET_PACKER_DEPENDS} ${INPUT_TXT}
+        DEPENDS ${ASSET_PACKER_DEPENDS} ${INPUT_TXT} ${ASSET_FILE_DEPS}
         COMMENT "Generating assets for test ${NAME}..."
     )
     set(${HEADER_VAR} ${OUT_H} PARENT_SCOPE)