Audio: WAV + tinyaudio, Ambient-Emitter mit Distance ramps; artist.md

engine/wav.rs (Decoder) und render/audio.rs (Mixer, 8 SFX-Voices +
Loop-Voice je Emitter) aus irl3d eingebettet; Emitter-Logik headless in
engine/audio.rs. Empties mit sound/radius-Property senden positional,
play_sound-Signale laufen als SFX über Session::take_sounds.
Platzhalter-Sounds + Emitter in der Testszene; artist.md fasst die
Content-Regeln für die Autorin zusammen.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/engine/signals.rs

@@ -15,7 +15,8 @@
 //!   `inc         <name> [<delta>]` KV-Integer inkrementieren (Default +1)
 //!   `clear       <name>`          KV-Eintrag entfernen
 //!   `hide_object <name>`          → Action::HideObject (deferred)
-//!   `play_sound  <file>`          → Action::PlaySound (deferred)
+//!   `play_sound  <name>`          → Action::PlaySound (deferred): SFX aus
+//!                                 `assets/sounds/{name}.wav`
 //!   `mode        <play|free|menu>` → Action::SetMode (deferred): Anzeige-/
 //!                                 Eingabemodus wechseln
 //!
@@ -182,7 +183,7 @@ mod tests {
         let mut signals = Signals::new();
         signals.insert("pickup".into(), vec![
             "inc items".into(),
-            "play_sound pickup.wav".into(),
+            "play_sound pickup".into(),
             "hide_object $self".into(),
         ]);
         let mut game = Game::new(signals);
@@ -192,7 +193,7 @@ mod tests {
 
         assert_eq!(game.kv["items"].coerce_to_int().unwrap(), 1);
         assert_eq!(game.actions, vec![
-            Action::PlaySound("pickup.wav".into()),
+            Action::PlaySound("pickup".into()),
             Action::HideObject("Mushroom.005".into()),
         ]);
     }