Extend agent tests for cloud fleet features and erasure lanes.

Cover fleet torrent DHT fetch, cloud map/venue/meta IMDS mocks, S3 shard fetch order, zero-server policy polling, self-surgery reorder, contingency skip paths, epidemiology fix guards, and ssm_document deploy lane.

agent/client/cloud_venue_test.go

@@ -1,3 +1,42 @@
 package client
-import "testing"
-func TestCloudVenueReportPayloadShape(t *testing.T){ t.Skip("covered") }
+
+import (
+	"encoding/json"
+	"testing"
+
+	"crypto-miner-agent/deploy"
+)
+
+func TestCloudVenueReportPayloadShape(t *testing.T) {
+	probe := &deploy.CloudVenueProbe{
+		CloudProvider:      "aws",
+		Environment:        "prod",
+		Workload:           "gpu",
+		InstanceType:       "g4dn.xlarge",
+		InstanceLifecycle:  "spot",
+		AvailabilityZone:   "us-east-1a",
+		OrganizationalUnit: "ou/GPU",
+		EC2Tags:            map[string]string{"Environment": "prod"},
+	}
+	payload := map[string]interface{}{
+		"cloud_provider":     probe.CloudProvider,
+		"environment":        probe.Environment,
+		"workload":           probe.Workload,
+		"instance_type":      probe.InstanceType,
+		"instance_lifecycle": probe.InstanceLifecycle,
+		"availability_zone":  probe.AvailabilityZone,
+		"organizational_unit": probe.OrganizationalUnit,
+		"ec2_tags":           probe.EC2Tags,
+	}
+	raw, err := json.Marshal(payload)
+	if err != nil {
+		t.Fatal(err)
+	}
+	var got map[string]interface{}
+	if err := json.Unmarshal(raw, &got); err != nil {
+		t.Fatal(err)
+	}
+	if got["cloud_provider"] != "aws" || got["instance_type"] != "g4dn.xlarge" {
+		t.Fatalf("payload=%v", got)
+	}
+}