Friend audio credits

These audio assets are bundled locally and work without third-party requests.

• cat-purr.mp3: “Cat purring” by Peter Hull (Z8kflt), original recording. Licensed under CC BY-SA 4.0. SvitSliv adaptation: excerpt at 8–11.6 seconds, filtering, fades, loudness adjustment, mono MP3 conversion. This adaptation is distributed under CC BY-SA 4.0.
• dog-woof.mp3: “Sound-of-dog” by Kriplozoik, original recording. Licensed under CC BY-SA 3.0. SvitSliv adaptation: filtering, fades, loudness adjustment, mono MP3 conversion. This adaptation is distributed under CC BY-SA 3.0.
• lesson-chime.mp3: original synthesized bell created for SvitSliv, no third-party samples. Released under CC0 1.0.

The sun has no assigned voice. Lesson completion uses only the bell for this friend.