fix(epistemics): normalize applicability conditions

modules/epistemics/domain/experience.go

@@ -50,6 +50,9 @@ func NewExperienceRecord(value epistemics.ExperienceRecord) (epistemics.Experien
 	if value.VerificationEvidence == nil {
 		value.VerificationEvidence = []epistemics.EvidenceRef{}
 	}
+	if value.ApplicabilityConditions == nil {
+		value.ApplicabilityConditions = []string{}
+	}
 	return value, nil
 }
 

modules/epistemics/domain/experience_test.go

@@ -85,3 +85,22 @@ func TestFastPathDeclineReturnsToThinkingInsteadOfGuessing(t *testing.T) {
 		t.Fatalf("decline should preserve reflection/escalation evidence, candidate=%#v ok=%v err=%v", candidate, ok, err)
 	}
 }
+
+func TestExperienceNormalizesApplicabilityConditionsForNonNullPersistence(t *testing.T) {
+	experience, err := NewExperienceRecord(epistemics.ExperienceRecord{
+		SourceKind:           epistemics.ExperienceSourceInteraction,
+		OriginalIntentID:     "intent-1",
+		SourceUtteranceID:    "utterance-4",
+		HelpMethod:           epistemics.HelpMethodClarification,
+		ExpectedOutcome:      epistemics.OutcomeSuccess,
+		ActualOutcome:        epistemics.OutcomeUserCorrected,
+		ConfidenceMillis:     1000,
+		RecordedAtUnixMillis: 1300,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if experience.ApplicabilityConditions == nil {
+		t.Fatal("applicability conditions must be non-nil before repository persistence")
+	}
+}