Upgrade dashboard, builder, and agent resource controls.

Dark UI with hashrate graphs, inline setting help, percent-based threads/RAM, configurable process name and display modes, and LAN-aware run.bat startup banner.

agent/miner/target_test.go

@@ -0,0 +1,28 @@
+package miner
+
+import (
+	"testing"
+)
+
+func TestHashMeetsTargetEqual(t *testing.T) {
+	target := "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
+	hash := "0000000000000000000000000000000000000000000000000000000000000001"
+	if !hashMeetsTarget(hash, target) {
+		t.Fatal("lower hash should meet high target")
+	}
+}
+
+func TestHashMeetsTargetReject(t *testing.T) {
+	target := "0000000000000000000000000000000000000000000000000000000000000001"
+	hash := "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
+	if hashMeetsTarget(hash, target) {
+		t.Fatal("high hash should not meet low target")
+	}
+}
+
+func TestDifficultyToTargetHex(t *testing.T) {
+	out := difficultyToTargetHex(1000)
+	if len(out) != 64 {
+		t.Fatalf("expected 64 hex chars, got %d", len(out))
+	}
+}