feat(delta): config persistence via Configurations.saveGlobalSection + decoupled sound range API

paper-api/src/main/java/org/bukkit/World.java

@@ -3616,6 +3616,28 @@ public interface World extends RegionAccessor, WorldInfo, PluginMessageRecipient
      */
     void playSound(@NotNull Entity entity, @NotNull Sound sound, @NotNull SoundCategory category, float volume, float pitch, long seed);
 
+    /**
+     * Delta: plays a sound with an explicit audible range, decoupled from volume.
+     * <p>
+     * In vanilla the audible distance is derived from volume (16 blocks per volume unit),
+     * so a sound that must be heard 150 blocks away requires volume ~10, which then clips
+     * badly for players standing next to the source. This overload lets you pick gain and
+     * distance independently.
+     * <p>
+     * Requires the Delta core with {@code delta.decoupled-sound-range-enabled: true};
+     * on any other server it silently falls back to vanilla behaviour.
+     *
+     * @param location the location to play the sound at
+     * @param sound the sound to play
+     * @param category the category of the sound
+     * @param volume the loudness at the source
+     * @param pitch the pitch of the sound
+     * @param range the audible radius in blocks, independent of volume
+     */
+    default void playSound(@NotNull Location location, @NotNull Sound sound, @NotNull SoundCategory category, float volume, float pitch, float range) {
+        playSound(location, sound, category, volume, pitch); // fallback: range == f(volume)
+    }
+
     /**
      * Play a Sound at the location of the provided entity in the World. For sounds
      * with multiple variations passing the same seed will always play the same

paper-server/src/main/java/io/papermc/paper/configuration/Configurations.java

@@ -139,6 +139,23 @@ public abstract class Configurations<G, W> {
         return instance;
     }
 
+    // Delta start - persist a single global config section
+    // Paper exposes no way to write paper-global.yml back after boot: reloadConfigs()
+    // re-reads from disk and would clobber any in-memory change. This writes just the
+    // requested section and leaves every other node exactly as it was parsed, so it can
+    // never damage unrelated settings.
+    public void saveGlobalSection(final RegistryAccess registryAccess, final String section, final Object value) throws ConfigurateException {
+        final Path configFile = this.globalFolder.resolve(this.globalConfigFileName);
+        final YamlConfigurationLoader loader = this.createGlobalLoaderBuilder(registryAccess)
+            .defaultOptions(this.applyObjectMapperFactory(this.createGlobalObjectMapperFactoryBuilder().build()))
+            .path(configFile)
+            .build();
+        final ConfigurationNode node = loader.load();
+        node.node(section).set(value);
+        trySaveFileNode(loader, node, configFile.toString());
+    }
+    // Delta end
+
     protected void verifyGlobalConfigVersion(final ConfigurationNode globalNode) {
         final ConfigurationNode version = globalNode.node(Configuration.VERSION_FIELD);
         if (version.virtual()) {

paper-server/src/main/java/me/sashegdev/delta/DeltaCommand.java

@@ -73,17 +73,14 @@ public class DeltaCommand extends Command {
                     cfg.displayTrackingRange = value;
                     sender.sendMessage(Component.text("Display tracking range set to " + value + " blocks", NamedTextColor.GREEN));
                 }
-                // Paper не даёт публичного API для записи paper-global.yml, поэтому
-                // это живая правка только в памяти: после рестарта вернётся значение
-                // из конфига. Постоянно — правкой paper-global.yml -> delta.
-                sender.sendMessage(Component.text(
-                        "Runtime-only. For a permanent change edit paper-global.yml -> delta.",
-                        NamedTextColor.GRAY));
+                // Paper не даёт публичного API для записи paper-global.yml — Delta добавляет
+                // saveGlobalSection(), который пишет только секцию delta и не трогает остальное.
+                persist(sender, "display range");
             }
             case "clear" -> {
                 var cfg = io.papermc.paper.configuration.GlobalConfiguration.get().delta;
                 cfg.displayTrackingRangeEnabled = false;
-                sender.sendMessage(Component.text("Runtime override cleared, back to config values", NamedTextColor.YELLOW));
+                persist(sender, "display range");
                 sender.sendMessage(line("display range     ", DeltaTracking.describe()));
             }
             case "help" -> sender.sendMessage(Component.text(
@@ -114,6 +111,25 @@ public class DeltaCommand extends Command {
         return List.of();
     }
 
+    /**
+     * Пишет секцию {@code delta} обратно в paper-global.yml.
+     * Записывается только наша секция — остальные узлы файла остаются как были распарсены,
+     * поэтому сломать чужие настройки этим невозможно.
+     */
+    private void persist(final CommandSender sender, final String what) {
+        final var server = Bukkit.getServer();
+        try {
+            server.paperConfigurations().saveGlobalSection(
+                    server.registryAccess(), "delta",
+                    io.papermc.paper.configuration.GlobalConfiguration.get().delta);
+            sender.sendMessage(Component.text("Saved to paper-global.yml -> delta (" + what + ")", NamedTextColor.DARK_GREEN));
+        } catch (Throwable t) {
+            sender.sendMessage(Component.text(
+                    "Applied at runtime, but failed to persist: " + t.getMessage(),
+                    NamedTextColor.RED));
+        }
+    }
+
     private Component header() {
         return Component.text("---- Delta ----", NamedTextColor.DARK_PURPLE);
     }

paper-server/src/main/java/org/bukkit/craftbukkit/CraftWorld.java

@@ -1889,6 +1889,37 @@ public class CraftWorld extends CraftRegionAccessor implements World {
         this.playSound(loc, sound, category, volume, pitch, this.getHandle().random.nextLong());
     }
 
+    // Delta start - decoupled sound range
+    // Vanilla derives audible distance from volume (SoundEvent#getRange = 16 * volume), so the
+    // only way to make a boss ability audible at 150 blocks is volume=10, which then clips
+    // badly for anyone standing next to the source. This sends the same packet with an
+    // explicit radius, keeping gain and distance independent.
+    @Override
+    public void playSound(Location loc, Sound sound, org.bukkit.SoundCategory category, float volume, float pitch, float range) {
+        org.spigotmc.AsyncCatcher.catchOp("play sound (decoupled range)"); // Paper
+        if (loc == null || sound == null || category == null) return;
+        if (!io.papermc.paper.configuration.GlobalConfiguration.get().delta.decoupledSoundRangeEnabled) {
+            this.playSound(loc, sound, category, volume, pitch, this.getHandle().random.nextLong()); // feature off: stock behaviour
+            return;
+        }
+
+        final double x = loc.getX();
+        final double y = loc.getY();
+        final double z = loc.getZ();
+
+        final net.minecraft.network.protocol.game.ClientboundSoundPacket packet = new net.minecraft.network.protocol.game.ClientboundSoundPacket(
+            CraftSound.bukkitToMinecraft(sound),
+            SoundSource.valueOf(category.name()),
+            x, y, z,
+            volume, pitch, this.getHandle().random.nextLong()
+        );
+
+        this.getServer().getHandle().getPlayerList().broadcast(
+            null, x, y, z, range, this.getHandle().dimension(), packet
+        );
+    }
+    // Delta end
+
     @Override
     public void playSound(Location loc, Sound sound, org.bukkit.SoundCategory category, float volume, float pitch, long seed) {
         org.spigotmc.AsyncCatcher.catchOp("play sound"); // Paper