feat: remove hard limit on number of channels

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

src/channel.c

@@ -6,35 +6,37 @@
 #include <string.h>
 
 void channel_add(jack_client_t *client, int idx) {
+  struct channel_t *cur = get_channels_array();
+
   char in_name[64], out_name[64];
   snprintf(in_name, sizeof(in_name), "channel%d_input", next_channel_id);
   snprintf(out_name, sizeof(out_name), "channel%d_output", next_channel_id);
 
-  channels[idx].audio_in = jack_port_register(
+  cur[idx].audio_in = jack_port_register(
       client, in_name, JACK_DEFAULT_AUDIO_TYPE, JackPortIsInput, 0);
-  channels[idx].audio_out = jack_port_register(
+  cur[idx].audio_out = jack_port_register(
       client, out_name, JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0);
-  if (!channels[idx].audio_in || !channels[idx].audio_out) {
+  if (!cur[idx].audio_in || !cur[idx].audio_out) {
     fprintf(stderr, "Failed to register ports for channel %d\n",
             next_channel_id);
-    /* Do NOT mark channel active – process loop will skip it */
-    atomic_store(&channels[idx].active, 0);
+    atomic_store(&cur[idx].active, 0);
     return;
   }
 
-  atomic_store(&channels[idx].active, 1);
-  atomic_store(&channels[idx].state, STATE_IDLE);
-  channels[idx].prev_state = -1;
-  channels[idx].loop_count = 0;
-  channels[idx].record_pos = 0;
-  channels[idx].playback_pos = 0;
+  atomic_store(&cur[idx].active, 1);
+  atomic_store(&cur[idx].state, STATE_IDLE);
+  cur[idx].prev_state = -1;
+  cur[idx].loop_count = 0;
+  cur[idx].record_pos = 0;
+  cur[idx].playback_pos = 0;
 
   next_channel_id++;
-  channel_count++;
+  atomic_fetch_add(&channel_count, 1);
 }
 
 void channel_remove(jack_client_t *client, int idx) {
   (void)client;
-  atomic_store(&channels[idx].active, 0);
-  channel_count--;
+  struct channel_t *cur = get_channels_array();
+  atomic_store(&cur[idx].active, 0);
+  atomic_fetch_sub(&channel_count, 1);
 }