feat: add project save/load with .wheel files and auto-save thread

Co-authored-by: aider (deepseek/deepseek-coder) <aider@aider.chat>

main.c

@@ -9,6 +9,7 @@
 #include "gui.h"
 #include "dispatcher.h"
 #include "carla.h"
+#include "fs.h"
 
 static Engine engine;
 static volatile int keep_running = 1;
@@ -95,6 +96,9 @@ int main(int argc, char *argv[]) {
     // Initialize dispatcher
     dispatch = dispatcher_init(&initial_state);
     
+    // Initialize filesystem module (auto-save thread)
+    fs_init(&initial_state);
+    
     // Initialize engine
     if (engine_init(&engine, client_name, dispatch) != 0) {
         fprintf(stderr, "Failed to initialize engine\n");
@@ -122,6 +126,18 @@ int main(int argc, char *argv[]) {
     printf("Sample rate: %u Hz\n", engine.sample_rate);
     printf("Press Ctrl+C to stop\n\n");
     
+    // Load project file if specified
+    if (optind < argc) {
+        const char *wheel_file = argv[optind];
+        size_t len = strlen(wheel_file);
+        if (len > 6 && strcmp(wheel_file + len - 6, ".wheel") == 0) {
+            Action action = { .type = ACTION_LOAD_PROJECT };
+            strncpy(action.data.load_project.filename, wheel_file, sizeof(action.data.load_project.filename) - 1);
+            action.data.load_project.filename[sizeof(action.data.load_project.filename) - 1] = '\0';
+            dispatch(action);
+        }
+    }
+    
     // Run selected frontend
     switch (frontend) {
         case FRONTEND_TUI:
@@ -141,6 +157,7 @@ int main(int argc, char *argv[]) {
     printf("\nShutting down...\n");
     engine_stop(&engine);
     engine_cleanup(&engine);
+    fs_cleanup();
     dispatcher_stop();
     
     return 0;