build: scaffold Spigot plugin project

src/main/java/games/dmg/triggerspawn/TriggerSpawnPlugin.java

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+package games.dmg.triggerspawn;
+
+import org.bukkit.plugin.java.JavaPlugin;
+
+/** Entry point for the Trigger Spawn Spigot plugin. */
+public final class TriggerSpawnPlugin extends JavaPlugin {
+}

src/main/resources/plugin.yml

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+name: TriggerSpawn
+version: '${version}'
+main: games.dmg.triggerspawn.TriggerSpawnPlugin
+api-version: '26.2'
+author: dmg.games
+description: Provides progression-gated safe teleportation to each world's spawn area.
+commands:
+  spawn:
+    description: Teleport to this world's spawn area.
+    usage: /spawn
+  spawnadmin:
+    description: Administer Trigger Spawn.
+    usage: /spawnadmin <set|distance|info|grant|remove|access|ban|unban|bans>
+    permission: triggerspawn.admin
+permissions:
+  triggerspawn.admin:
+    description: Allows administration of Trigger Spawn.
+    default: op

src/test/java/games/dmg/triggerspawn/PluginMetadataTest.java

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+package games.dmg.triggerspawn;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+import java.io.InputStream;
+import java.util.Map;
+import org.junit.jupiter.api.Test;
+import org.yaml.snakeyaml.Yaml;
+
+final class PluginMetadataTest {
+    @Test
+    void packagedPluginMetadataDeclaresLoadableSpigotPlugin() throws Exception {
+        Map<String, Object> metadata;
+        try (InputStream input = getClass().getResourceAsStream("/plugin.yml")) {
+            assertNotNull(input, "plugin.yml must be packaged");
+            metadata = new Yaml().load(input);
+        }
+
+        assertEquals("TriggerSpawn", metadata.get("name"));
+        assertEquals("26.2", metadata.get("api-version"));
+        assertEquals("games.dmg.triggerspawn.TriggerSpawnPlugin", metadata.get("main"));
+        assertNotNull(Class.forName((String) metadata.get("main")));
+    }
+}