fix: Improve Confluence/Jira detection precision

- Add domain-specific matching for Atlassian services
- Fix Confluence being misclassified as Jira
- Add comprehensive test coverage for notification detection
- Add example configuration file with new options
- All 13 tests now passing

Files modified:
- src/mail/notification_detector.py: Better atlassian.net handling
- tests/test_notification_detector.py: Full test suite
- mail.toml.example: Config documentation with examples

src/mail/notification_detector.py

@@ -17,10 +17,17 @@ class NotificationType:
     def matches(self, envelope: Dict[str, Any], content: Optional[str] = None) -> bool:
         """Check if envelope matches this notification type."""
 
-        # Check sender domain
+        # Check sender domain (more specific check)
         from_addr = envelope.get("from", {}).get("addr", "").lower()
-        if any(domain in from_addr for domain in self.domains):
-            return True
+        for domain in self.domains:
+            # For atlassian.net, check if it's specifically jira or confluence in the address
+            if domain == "atlassian.net":
+                if "jira@" in from_addr:
+                    return self.name == "jira"
+                elif "confluence@" in from_addr:
+                    return self.name == "confluence"
+            elif domain in from_addr:
+                return True
 
         # Check subject patterns
         subject = envelope.get("subject", "").lower()