chore: ignore plugin build artifacts and editor config

.gitignore

@@ -22,8 +22,14 @@ npm-debug.log*
 # ---- Java / Gradle plugins (build artifacts only; build.gradle + src stay) ----
 plugins/*/build/
 plugins/*/.gradle/
+plugins/*/bin/
 .gradle/
 
+# ---- Editor / IDE ----
+.vscode/
+.idea/
+*.iml
+
 # ---- Secrets / keys (NEVER commit) ----
 *.pem
 *.key