Add source models

src/models/severity.py

@@ -0,0 +1,38 @@
+"""Severity levels for validation findings."""
+
+from enum import Enum
+
+
+class Severity(Enum):
+    """Severity levels for validation findings."""
+
+    LOW = "low"
+    MEDIUM = "medium"
+    HIGH = "high"
+    CRITICAL = "critical"
+
+    @classmethod
+    def from_string(cls, value: str) -> "Severity":
+        """Create severity from string value."""
+        value_lower = value.lower()
+        for severity in cls:
+            if severity.value == value_lower:
+                return severity
+        raise ValueError(f"Unknown severity level: {value}")
+
+    def __lt__(self, other: "Severity") -> bool:
+        """Compare severity levels."""
+        order = [Severity.LOW, Severity.MEDIUM, Severity.HIGH, Severity.CRITICAL]
+        return order.index(self) < order.index(other)
+
+    def __le__(self, other: "Severity") -> bool:
+        """Compare severity levels (less than or equal)."""
+        return self == other or self < other
+
+    def __gt__(self, other: "Severity") -> bool:
+        """Compare severity levels (greater than)."""
+        return not self <= other
+
+    def __ge__(self, other: "Severity") -> bool:
+        """Compare severity levels (greater than or equal)."""
+        return not self < other