feat: Implement workspace system (Task #77)

Self-contained workspaces for parallel demo development.

Structure:
- workspaces/main,test - Demo-specific resources
- assets/common - Shared resources
- workspace.cfg - Configuration per workspace

CMake integration:
- DEMO_WORKSPACE option (defaults to main)
- cmake/ParseWorkspace.cmake - Config parser
- Workspace-relative asset/timeline/music paths

Migration:
- Main demo: demo.seq to workspaces/main/timeline.seq
- Test demo: test_demo.seq to workspaces/test/timeline.seq
- Common shaders: assets/common/shaders
- Workspace shaders: workspaces/*/shaders

Build:
cmake -B build -DDEMO_WORKSPACE=main
cmake -B build_test -DDEMO_WORKSPACE=test

All tests passing (36/36).

handoff(Claude): Task #77 workspace system complete. Both main and test workspaces build and pass all tests.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

1 files changed, 28 insertions, 8 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index acae668..c35695f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -14,6 +14,7 @@ option(DEMO_BUILD_TOOLS "Build tools" OFF)
 option(DEMO_ENABLE_COVERAGE "Enable code coverage generation (macOS only)" OFF)
 option(DEMO_ENABLE_DEBUG_LOGS "Enable all debug logging (for pre-commit checks)" OFF)
 option(DEMO_ALL_OPTIONS "Activate all options at once" OFF)
+set(DEMO_WORKSPACE "main" CACHE STRING "Active workspace (main, test, etc.)")
 
 if (DEMO_ALL_OPTIONS)
     set(DEMO_SIZE_OPT ON)
@@ -55,6 +56,15 @@ if (DEMO_ENABLE_DEBUG_LOGS)
     add_definitions(-DDEBUG_LOG_ALL)
 endif()
 
+#-- - Workspace Configuration -- -
+include(cmake/ParseWorkspace.cmake)
+set(WORKSPACE_DIR "${CMAKE_SOURCE_DIR}/workspaces/${DEMO_WORKSPACE}")
+if(NOT EXISTS "${WORKSPACE_DIR}/workspace.cfg")
+    message(FATAL_ERROR "Workspace not found: ${DEMO_WORKSPACE} (${WORKSPACE_DIR})")
+endif()
+parse_workspace_config("${WORKSPACE_DIR}")
+message(STATUS "Using workspace: ${DEMO_WORKSPACE}")
+
 #-- - Platform Detection and Core Setup -- - 
 if(APPLE)
     add_definitions(-DGLFW_EXPOSE_NATIVE_COCOA)
@@ -228,6 +238,9 @@ endif()
 function(parse_asset_list INPUT_TXT OUT_FILE_LIST)
     set(ASSET_FILES "")
     if(EXISTS ${INPUT_TXT})
+        # Get directory of INPUT_TXT for relative path resolution
+        get_filename_component(INPUT_DIR ${INPUT_TXT} DIRECTORY)
+
         file(STRINGS ${INPUT_TXT} LINES)
         foreach(LINE ${LINES})
             # Skip comments and empty lines
@@ -236,8 +249,14 @@ function(parse_asset_list INPUT_TXT OUT_FILE_LIST)
                 # Extract filename (third field: ASSET_NAME, COMPRESSION, FILENAME, DESC)
                 string(REGEX REPLACE "^[^,]+,[^,]+,[ ]*([^,]+).*" "\\1" FILENAME "${LINE}")
                 string(STRIP "${FILENAME}" FILENAME)
-                # Build full path
-                set(FULL_PATH "${CMAKE_CURRENT_SOURCE_DIR}/assets/final/${FILENAME}")
+
+                # Try workspace-relative path first
+                set(FULL_PATH "${INPUT_DIR}/${FILENAME}")
+                if(NOT EXISTS ${FULL_PATH})
+                    # Fall back to legacy path for compatibility
+                    set(FULL_PATH "${CMAKE_CURRENT_SOURCE_DIR}/assets/final/${FILENAME}")
+                endif()
+
                 if(EXISTS ${FULL_PATH})
                     list(APPEND ASSET_FILES ${FULL_PATH})
                 endif()
@@ -297,8 +316,9 @@ macro(add_demo_test NAME TEST_NAME)
     add_test(NAME ${TEST_NAME} COMMAND ${NAME})
 endmacro()
 
-#-- - Generation Targets -- - 
-set(DEMO_SEQ_PATH ${CMAKE_CURRENT_SOURCE_DIR}/assets/demo.seq)
+#-- - Generation Targets -- -
+# Use workspace-configured paths
+set(DEMO_SEQ_PATH ${WORKSPACE_TIMELINE})
 set(GENERATED_TIMELINE_CC ${CMAKE_CURRENT_SOURCE_DIR}/src/generated/timeline.cc)
 add_custom_command(
     OUTPUT ${GENERATED_TIMELINE_CC}
@@ -306,22 +326,22 @@ add_custom_command(
     COMMAND ${SEQ_COMPILER_CMD} ${DEMO_SEQ_PATH} ${GENERATED_TIMELINE_CC}
     DEPENDS ${SEQ_COMPILER_DEPENDS} ${DEMO_SEQ_PATH}
             src/gpu/demo_effects.h
-    COMMENT "Compiling demo sequence..."
+    COMMENT "Compiling demo sequence from workspace ${DEMO_WORKSPACE}..."
 )
 add_custom_target(generate_timeline ALL DEPENDS ${GENERATED_TIMELINE_CC})
 
-set(TRACKER_MUSIC_PATH ${CMAKE_CURRENT_SOURCE_DIR}/assets/music.track)
+set(TRACKER_MUSIC_PATH ${WORKSPACE_MUSIC})
 set(GENERATED_MUSIC_DATA_CC ${CMAKE_CURRENT_SOURCE_DIR}/src/generated/music_data.cc)
 add_custom_command(
     OUTPUT ${GENERATED_MUSIC_DATA_CC}
     COMMAND ${CMAKE_COMMAND} -E make_directory ${CMAKE_CURRENT_SOURCE_DIR}/src/generated
     COMMAND ${TRACKER_COMPILER_FINAL_CMD} ${TRACKER_MUSIC_PATH} ${GENERATED_MUSIC_DATA_CC}
     DEPENDS ${TRACKER_COMPILER_FINAL_DEPENDS} ${TRACKER_MUSIC_PATH} tracker_compiler_host
-    COMMENT "Compiling tracker music..."
+    COMMENT "Compiling tracker music from workspace ${DEMO_WORKSPACE}..."
 )
 add_custom_target(generate_tracker_music ALL DEPENDS ${GENERATED_MUSIC_DATA_CC})
 
-pack_assets(assets ${CMAKE_CURRENT_SOURCE_DIR}/assets/final/demo_assets.txt GEN_DEMO_H GEN_DEMO_CC generate_demo_assets)
+pack_assets(assets ${WORKSPACE_ASSETS} GEN_DEMO_H GEN_DEMO_CC generate_demo_assets)
 pack_test_assets(test_assets ${CMAKE_CURRENT_SOURCE_DIR}/assets/final/test_assets_list.txt GEN_TEST_H GEN_TEST_CC generate_test_assets)
 
 # Mark generated files so CMake always checks if they need rebuilding