feat: add configurable AgentRouter AI provider

internal/growthreport/adapter_test.go

@@ -1,6 +1,8 @@
 package growthreport
 
 import (
+	"context"
+	"encoding/json"
 	"fmt"
 	"strings"
 	"testing"
@@ -9,6 +11,34 @@ import (
 	"git.amiirkhl.ir/starcoach-hackathon/zarinpal-analytics-backend/internal/growth"
 )
 
+func TestEvidenceToolsReturnsUnavailableForKnownEventWithoutPlaybook(t *testing.T) {
+	t.Parallel()
+	tools := NewEvidenceTools(Analysis{
+		Evidence: Evidence{Events: []UpcomingEvent{{EvidenceID: "event:known"}}},
+		Fallback: &AICopy{},
+	})
+
+	got, err := tools.Execute(context.Background(), "get_campaign_playbook", json.RawMessage(`{"evidenceId":"event:known"}`))
+	if err != nil {
+		t.Fatalf("Execute() error = %v, want an explicit unavailable result", err)
+	}
+	if string(got) != `{"state":"UNAVAILABLE","reason":"NO_PLAYBOOK"}` {
+		t.Fatalf("Execute() = %s", got)
+	}
+}
+
+func TestEvidenceToolsRejectsUnknownPlaybookEvidence(t *testing.T) {
+	t.Parallel()
+	tools := NewEvidenceTools(Analysis{
+		Evidence: Evidence{Events: []UpcomingEvent{{EvidenceID: "event:known"}}},
+		Fallback: &AICopy{},
+	})
+
+	if _, err := tools.Execute(context.Background(), "get_campaign_playbook", json.RawMessage(`{"evidenceId":"event:unknown"}`)); err == nil {
+		t.Fatal("Execute() error = nil, want unknown evidence error")
+	}
+}
+
 func TestUpcomingEventsKeepsFiveChronologicalEligibleCandidates(t *testing.T) {
 	t.Parallel()
 	start := time.Date(2026, time.August, 22, 0, 0, 0, 0, time.UTC)