feat(domain): añade modelos GuardrailViolation, PolicyDefinition y AgentExecution

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

tests/unit/test_domain_guardrail.py

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+"""Tests del modelo GuardrailViolation."""
+
+from datetime import UTC, datetime
+from uuid import uuid4
+
+import pytest
+from pydantic import ValidationError
+
+from agentforge_core.domain.guardrail import GuardrailViolation
+
+
+def test_guardrail_violation_minimo_valido() -> None:
+    v = GuardrailViolation(
+        trace_id=uuid4(),
+        timestamp=datetime.now(UTC),
+        stage="input",
+        validator="DetectPII",
+        severity="block",
+        message="DNI detectado",
+        blocked=True,
+    )
+    assert v.blocked is True
+
+
+def test_guardrail_violation_rechaza_severity_invalido() -> None:
+    with pytest.raises(ValidationError):
+        GuardrailViolation(
+            trace_id=uuid4(),
+            timestamp=datetime.now(UTC),
+            stage="input",
+            validator="x",
+            severity="critical",  # type: ignore[arg-type]
+            message="x",
+            blocked=True,
+        )