chore: standardize repository ignore rules

.gitignore

@@ -1,53 +1,58 @@
-# Maven
+# Build output
 target/
-pom.xml.tag
-pom.xml.releaseBackup
-pom.xml.versionsBackup
-pom.xml.next
+build/
+out/
+dist/
+nbbuild/
+nbdist/
+*.class
 dependency-reduced-pom.xml
-release.properties
 
-# Compiled / generated
-*.class
+# Build dependencies
+/.build/
 *.jar
-*.war
-*.ear
-hs_err_pid*
-replay_pid*
+!.mvn/wrapper/maven-wrapper.jar
 
-# IDE
-*.iml
+# Python caches and environments
+__pycache__/
+*.py[cod]
+.venv/
+venv/
+
+# IDE files
 .idea/
+*.iml
 *.ipr
 *.iws
+.vscode/
 .project
 .classpath
 .settings/
-.vscode/
 nbproject/private/
-build/
-nbbuild/
-dist/
-nbdist/
 .nb-gradle/
-out/
 
-# Editor / temp
+# Logs and temporary files
+*.log
+hs_err_pid*
+replay_pid*
 *.bak
 *.swp
 *.tmp
 *~
 
-# OS
+# Operating system files
 .DS_Store
 Thumbs.db
 Desktop.ini
 
-# Logs
-*.log
-
-# Downloaded build dependencies
-/libs/*.jar
+# Local investigation notes and test artifacts
+/.scratch/
 
-# Resolved build dependency metadata
-.build/
+# Repository-specific files
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+pom.xml.next
+release.properties
+*.war
+*.ear