build(plugin): establish build and release pipeline

src/main/java/games/dmg/spigotstealth/SpigotStealthPlugin.java

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+package games.dmg.spigotstealth;
+
+import org.bukkit.plugin.java.JavaPlugin;
+
+/** Bukkit entry point for Spigot Stealth. */
+public final class SpigotStealthPlugin extends JavaPlugin {
+    @Override
+    public void onEnable() {
+        getLogger().info("Spigot Stealth enabled");
+    }
+}

src/main/resources/plugin.yml

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+name: SpigotStealth
+version: ${version}
+main: games.dmg.spigotstealth.SpigotStealthPlugin
+api-version: "1.20"
+description: Rewards invisibility potion use with identity-concealed sessions.
+author: dmg.games
+commands:
+  stealth:
+    description: View and use Spigot Stealth features.
+    usage: /stealth progress
+    permission: spigotstealth.use
+  stealthadmin:
+    description: Inspect and administer Spigot Stealth.
+    usage: /stealthadmin <status|grant|reset|list>
+    permission: spigotstealth.admin
+permissions:
+  spigotstealth.use:
+    description: Allows use of player-facing Spigot Stealth commands.
+    default: true
+  spigotstealth.admin:
+    description: Allows administration of Spigot Stealth.
+    default: op