gitignore: add CAD/CAM build output patterns (*.step, *.stl, caos_images/, --help/)

.gitignore

@@ -1,3 +1,28 @@
 .obsidian/workspace*.json
 .obsidian/cache/
 .trash/
+
+# Python caches
+__pycache__/
+*.py[cod]
+
+# Local/generated tool state
+.clawhub/
+**/.clawhub/
+**/.learnings/
+
+# Local databases and volatile outputs
+*.sqlite
+*.sqlite3
+*.db
+*.db-journal
+
+# Generated job data
+data/*.jsonl
+
+# CAD/CAM build outputs (transient, not source)
+*.step
+*.stl
+CAD_Exports/
+caos_images/
+--help/