feat(idm): govern delegation chains and timed escalation

src/govoplan_idm/backend/api/v1/function_changes.py

@@ -244,6 +244,10 @@ def _change_item(
         workflow_current_step_id=change.workflow_current_step_id,
         resulting_assignment_id=change.resulting_assignment_id,
         expires_at=change.expires_at,
+        review_deadline_at=change.review_deadline_at,
+        escalated_at=change.escalated_at,
+        escalation_from_state=change.escalation_from_state,
+        escalation_target_function_id=change.escalation_target_function_id,
         outcome_reason=change.outcome_reason,
         resource_revision=change.resource_revision,
         etag=change.strong_etag,
@@ -297,6 +301,18 @@ def _record_change_audit(
             "workflow_instance_id": change.workflow_instance_id,
             "evidence": list(change.evidence),
             "resulting_assignment_id": change.resulting_assignment_id,
+            "review_deadline_at": (
+                change.review_deadline_at.isoformat()
+                if change.review_deadline_at
+                else None
+            ),
+            "escalated_at": (
+                change.escalated_at.isoformat() if change.escalated_at else None
+            ),
+            "escalation_from_state": change.escalation_from_state,
+            "escalation_target_function_id": (
+                change.escalation_target_function_id
+            ),
             "resource_revision": change.resource_revision,
         },
         commit=False,
@@ -370,6 +386,18 @@ def get_function_assignment_capability(
             decision and decision.recipient_acceptance_required
         ),
         maximum_validity_days=(decision.maximum_validity_days if decision else None),
+        delegation_allowed=bool(decision and decision.delegation_allowed),
+        maximum_delegation_depth=(
+            decision.maximum_delegation_depth if decision else 0
+        ),
+        maximum_delegated_validity_days=(
+            decision.maximum_delegated_validity_days if decision else None
+        ),
+        escalation_rules=(
+            [rule.to_dict() for rule in decision.escalation_rules]
+            if decision
+            else []
+        ),
         workflow_available=registry.has_capability(CAPABILITY_WORKFLOW_ORCHESTRATION),
         policy_available=registry.has_capability(
             CAPABILITY_POLICY_FUNCTION_ASSIGNMENT_GOVERNANCE