fix(waveform): legal notices and reformatting

This commit effectively grants [the "Atoll" project](https://github.com/Ebullioscopic/Atoll) permission from [ZephyrCodesStuff](https://github.com/ZephyrCodesStuff) for using, modifying and distributing the source code contained in [`rtaudio`](https://github.com/ZephyrCodesStuff/rtaudio) in compliance with the terms of the GPLv3 license, as an alternative to its original AGPLv3 license for this specific integration.

DynamicIsland/audio/AudioBridge.mm

@@ -1,14 +1,22 @@
 /*
  * Atoll (DynamicIsland)
- * Copyright (C) 2024-2026 Atoll Contributors and zeph
- * Adapted from rtaudio (https://github.com/ZephyrCodesStuff/rtaudio)
+ * Original work Copyright (C) 2026 ZephyrCodesStuff (https://github.com/ZephyrCodesStuff/rtaudio)
+ * Modified work Copyright (C) 2026 Atoll Contributors
  *
  * Objective-C++ implementation bridging AudioProcessor to Swift.
  *
  * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as published by
+ * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
+ *
+ * This file is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
  */
 
 #import "AudioBridge.h"
@@ -31,8 +39,6 @@
 }
 
 - (simd_float4)getSmoothedMagnitudes {
-    // Calls getBand() which does memory_order_relaxed atomic loads —
-    // no heap allocation, safe to call from the render thread
     return simd_make_float4(
         processor->getBand(0),
         processor->getBand(1),