fix: re-enable wifi, reduce scan from 2s to 30s interval

notepat.mjs was calling wifi.scan() every 120 frames (2s) which
triggered iw scan causing 65ms+ frame drops. Reduced to every
1800 frames (30s). WiFi re-enabled in C init.

Default passwords: aesthetic.computer (hardcoded in notepat.mjs),
additional creds loaded from /mnt/wifi_creds.json on boot.

Co-Authored-By: Claude Opus 4.6 (1M context) <[e-mail]>

fedac/native/pieces/notepat.mjs

···
   }
 
   if (autoConnectEnabled && isIdle) {
-    // Trigger scan every ~2s (120 frames), immediate on first frame
-    if (autoConnectFrame <= 1 || autoConnectFrame % 120 === 0) {
+    // Trigger scan every ~30s (1800 frames) — iw scan causes 65ms+ frame
+    // drops so keep it infrequent. Immediate on first frame only.
+    if (autoConnectFrame <= 1 || autoConnectFrame % 1800 === 0) {
       wifi.scan?.();
     }
     // 60 frames (~1s) after scan: pick strongest known network from scan results

fedac/native/src/ac-native.c

···
         if (!wifi_disabled) {
             if (!headless && display)
                 draw_boot_status(&graph, screen, display, "starting wifi...", pixel_scale);
-            // WiFi disabled — notepat.mjs scans every 2s which causes 65ms+
-            // frame drops from iw scan. Re-enable once scan is non-blocking.
-            wifi = NULL;
+            wifi = wifi_init();
+            // Don't autoconnect from C — notepat.mjs handles scanning
+            // at 30s intervals (reduced from 2s to avoid 65ms frame drops).
         } else {
             if (!headless && display)
                 draw_boot_status(&graph, screen, display, "wifi disabled", pixel_scale);