Remove .lingma agents, add yaml_create_supervisor_with_service example

- Remove 4 legacy .lingma agent config files (foundation, pipeline, meltdown, backoff)
- Add yaml_create_supervisor_with_service example with main.rs and supervisor.yaml
- Wire the new example into supervisor_examples_test.rs
- Update .gitignore accordingly

Author: developerworks

.gitignore

@@ -13,4 +13,9 @@ Thumbs.db
 *.swp
 .vscode/
 .idea/
-/config
+/config
+/_bmad-output
+/_bmad
+/.agent
+/.agents
+/.github/agents