feat: add greet helper and document Sonar quality gate

Co-authored-by: Cursor <cursoragent@cursor.com>

README.md

@@ -1,5 +1,7 @@
 # TicketLab_MCP
 
+[![Quality Gate Status](https://sonarqube.app.andreferraro.com/api/project_badges/measure?project=TicketLab_MCP&metric=alert_status&token=sqb_4b948ba1389feb0284d7d2630171396ed00b4478)](https://sonarqube.app.andreferraro.com/dashboard?id=TicketLab_MCP)
+
 Hello world — repositório de testes MCP do TicketLab.
 
 ## Quick start
@@ -7,3 +9,7 @@ Hello world — repositório de testes MCP do TicketLab.
 ```bash
 python hello.py
 ```
+
+## CI / quality gate
+
+Pushes and PRs into `develop`, `release/**` and `main` run SonarQube via Gitea Actions. Merge is blocked until the Quality Gate passes.

hello.py

@@ -1,8 +1,13 @@
 """Hello world for TicketLab_MCP."""
 
 
+def greet(name: str = "TicketLab MCP") -> str:
+    """Return a greeting for the given name."""
+    return f"Hello, {name}!"
+
+
 def main() -> None:
-    print("Hello, TicketLab MCP!")
+    print(greet())
 
 
 if __name__ == "__main__":