Sounds for weather, rogues and groves: thunder, rain and wind ambience, coin theft, snares, sermons, spores

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/main.rs

@@ -1992,6 +1992,7 @@ app.pending_briefing = briefing_of(&campaign, i);
         for ev in app.game.events.drain(..) {
             sounds.play(ev, vec2(app.cam.rx, app.cam.rz), right, hear, now);
         }
+        sounds.ambience(&app.game, (app.cam.rx, app.cam.rz), now);
         // a won mission goes into the campaign progress (with the carry-over); a co-op mission of an
         // editor campaign keeps no progress (its index is not a built-in mission)
         if app.coop_editor {