ASSEMBLY ARRIVAL SOUNDS

Wood: impactWood_medium_000.ogg
Stone/mineral: impactMining_000.ogg
Glass: impactGlass_light_000.ogg (light contact, not glass breaking).

Source: Kenney, Impact Sounds 1.0, https://kenney.nl/assets/impact-sounds
License: Creative Commons Zero (CC0); original license included unchanged.
Converted locally to compact mono PCM WAV. No external player/download is
needed on Windows. Existing native macOS playback uses the system audio player.
The sound begins at each incoming part's final assembly time. It is not
stretched with motion or repeated while a part travels.
