Close test-gap noise rows and sync coverage documentation.

Restore P1/P2/fleet/erasure COVERED rows in PROBLEMS.md with refreshed counts; drop fixed poll-duplication and Vitest-noise items. Silence ECONNREFUSED stderr in Vitest setup, alias download mock exports, and expand erasure/Path Tracer test coverage.

server/internal/api/spreadrouter_bridge_test.go

@@ -0,0 +1,29 @@
+package api
+
+import (
+	"testing"
+
+	"crypto-miner-server/internal/db"
+	"crypto-miner-server/internal/models"
+)
+
+func TestBuildSpreadRouterInputErasureFlag(t *testing.T) {
+	database, err := db.New(t.TempDir())
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() { _ = database.Close() })
+
+	hub := NewWSHub(database)
+	hub.SetServerPolicy(ServerPolicy{ErasureLanesEnabled: true})
+	if err := database.UpsertAgent(&models.Agent{ID: "router-seed", Name: "Seed", IP: "10.9.8.9", Status: "online"}); err != nil {
+		t.Fatal(err)
+	}
+	connectTestAgent(t, hub, "router-seed")
+	waitForHubAgents(t, hub, "router-seed")
+
+	in := buildSpreadRouterInput(hub, nil, []string{"10.9.8"}, "do_peer")
+	if !in.ErasureLanesEnabled {
+		t.Fatal("expected erasure_lanes_enabled on spread router input")
+	}
+}