Establish certifiable Voting provider boundary

src/govoplan_voting/backend/local_confidential_provider.py

@@ -21,8 +21,10 @@ from govoplan_core.core.voting import (
     ExternalVotingCastRequest,
     ExternalVotingFinalizationRequest,
     ExternalVotingPreparationRequest,
+    VOTING_CERTIFICATION_NOT_CERTIFIED,
     VotingReceipt,
     VotingResult,
+    VotingProviderAssuranceDeclaration,
 )
 from govoplan_voting.backend.db.models import (
     VotingConfidentialBallot,
@@ -49,6 +51,19 @@ class LocalConfidentialVotingProvider:
     def __init__(self, registry: object | None) -> None:
         self._registry = registry
 
+    def assurance_declaration(self) -> VotingProviderAssuranceDeclaration:
+        return VotingProviderAssuranceDeclaration(
+            provider_id=LOCAL_CONFIDENTIAL_PROVIDER_ID,
+            implementation_ref="govoplan-voting/local-confidential@1",
+            supported_assurance_profiles=("confidential",),
+            certification_state=VOTING_CERTIFICATION_NOT_CERTIFIED,
+            protocol_ref="govoplan:voting:local-confidential",
+            protocol_version="1.0",
+            notes=(
+                "Server-readable reference provider; no anonymity, secrecy, coercion-resistance, or certification claim.",
+            ),
+        )
+
     def prepare_ballot(
         self,
         session: object,