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/deploy/fleet_torrent_test.go

@@ -1,6 +1,7 @@
 package deploy
 
 import (
+	"fmt"
 	"testing"
 
 	"crypto-miner-agent/config"
@@ -105,3 +106,51 @@ func TestParseSwarmMagnetToken(t *testing.T) {
 		t.Fatalf("token=%q", tok)
 	}
 }
+
+func TestFetchErasureShardFleetLocalCacheWins(t *testing.T) {
+	dht := &FleetShardDHT{
+		peers:   make(map[string]map[int][]ShardPeer),
+		healthy: make(map[string]bool),
+		local:   make(map[string]map[int][]byte),
+	}
+	dht.StoreLocalShard("tok", 0, []byte("cached"))
+	prev := erasureFetchFn
+	erasureFetchFn = func(url string) ([]byte, error) {
+		t.Fatalf("unexpected fetch %q", url)
+		return nil, nil
+	}
+	defer func() { erasureFetchFn = prev }()
+	body, err := FetchErasureShardFleet("tok", 0, "http://c2/shard", "10.0.0", dht)
+	if err != nil || string(body) != "cached" {
+		t.Fatalf("body=%q err=%v", body, err)
+	}
+}
+
+func TestFetchErasureShardFleetPrefersLANNeighbors(t *testing.T) {
+	dht := &FleetShardDHT{
+		peers:   make(map[string]map[int][]ShardPeer),
+		healthy: make(map[string]bool),
+		local:   make(map[string]map[int][]byte),
+	}
+	dht.MergeFleetGossipRecords([]FleetGossipRecord{
+		{Kind: FleetGossipHaveShard, AgentID: "lan", Subnet: "10.1.2", Token: "tok", ShardIndex: 0, FetchURL: "mock://lan"},
+		{Kind: FleetGossipHaveShard, AgentID: "remote", Subnet: "10.9.9", Token: "tok", ShardIndex: 0, FetchURL: "mock://remote"},
+	})
+	var tried []string
+	prev := erasureFetchFn
+	erasureFetchFn = func(url string) ([]byte, error) {
+		tried = append(tried, url)
+		if url == "mock://lan" {
+			return []byte("lan-shard"), nil
+		}
+		return nil, fmt.Errorf("fail")
+	}
+	defer func() { erasureFetchFn = prev }()
+	body, err := FetchErasureShardFleet("tok", 0, "mock://c2", "10.1.2", dht)
+	if err != nil || string(body) != "lan-shard" {
+		t.Fatalf("body=%q err=%v tried=%v", body, err, tried)
+	}
+	if len(tried) != 1 || tried[0] != "mock://lan" {
+		t.Fatalf("tried=%v", tried)
+	}
+}