feat(examples): four runnable plugin examples

- player-load: load-on-join (PlayerReadyEvent → IO → modify).
- async-moderation: IAsyncEvent → coroutine bridge for chat moderation.
- periodic-leaderboard: pluginScope loop with parallel reads.
- bounty-board: kitchen-sink demo exercising every v0.1 primitive.

examples/bounty-board/settings.gradle.kts

@@ -0,0 +1,18 @@
+rootProject.name = "bounty-board"
+
+dependencyResolutionManagement {
+    repositories {
+        mavenCentral()
+        maven("https://maven.hytale.com/release") { name = "hytale" }
+    }
+    versionCatalogs {
+        create("libs") { from(files("../../gradle/libs.versions.toml")) }
+    }
+}
+
+includeBuild("../..") {
+    dependencySubstitution {
+        substitute(module("com.mythlane:async"))
+            .using(project(":dist"))
+    }
+}