feat: add command queue and FIFO pipe for unified input handling

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

src/main.c

@@ -1,5 +1,6 @@
 // cppcheck-suppress missingIncludeSystem
 #include "looper.h"
+#include "pipe.h"
 #include <jack/jack.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -33,6 +34,12 @@ int main(int argc, char *argv[]) {
     return 1;
   }
 
+  if (pipe_start_reader() != 0) {
+    fprintf(stderr, "pipe reader initialisation failed\n");
+    jack_client_close(client);
+    return 1;
+  }
+
   if (jack_activate(client)) {
     fprintf(stderr, "Cannot activate client\n");
     jack_client_close(client);