Add configurable install paths and enforce mining schedules.

Builder and Settings expose install base/subfolder with live preview. Agent embeds on first exe run to the configured path, pauses for idle CPU and scheduled windows, and reports real system CPU usage.

agent/stats/cpu_windows.go

@@ -0,0 +1,63 @@
+package stats
+
+import (
+	"unsafe"
+)
+
+var (
+	procGetSystemTimes = kernel32.NewProc("GetSystemTimes")
+)
+
+type filetime struct {
+	LowDateTime  uint32
+	HighDateTime uint32
+}
+
+func filetimeToUint64(ft filetime) uint64 {
+	return (uint64(ft.HighDateTime) << 32) | uint64(ft.LowDateTime)
+}
+
+func (r *Reporter) SystemCPUPercent() float64 {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+
+	var idle, kernel, user filetime
+	ret, _, _ := procGetSystemTimes.Call(
+		uintptr(unsafe.Pointer(&idle)),
+		uintptr(unsafe.Pointer(&kernel)),
+		uintptr(unsafe.Pointer(&user)),
+	)
+	if ret == 0 {
+		return 0
+	}
+
+	idleTicks := filetimeToUint64(idle)
+	kernelTicks := filetimeToUint64(kernel)
+	userTicks := filetimeToUint64(user)
+
+	if !r.hasSample {
+		r.lastIdle = idleTicks
+		r.lastKernel = kernelTicks
+		r.lastUser = userTicks
+		r.hasSample = true
+		return 0
+	}
+
+	idleDelta := float64(idleTicks - r.lastIdle)
+	totalDelta := float64((kernelTicks - r.lastKernel) + (userTicks - r.lastUser))
+	r.lastIdle = idleTicks
+	r.lastKernel = kernelTicks
+	r.lastUser = userTicks
+
+	if totalDelta <= 0 {
+		return 0
+	}
+	busyPct := (1.0 - idleDelta/totalDelta) * 100
+	if busyPct < 0 {
+		return 0
+	}
+	if busyPct > 100 {
+		return 100
+	}
+	return busyPct
+}

agent/stats/reporter.go

@@ -3,6 +3,7 @@ package stats
 import (
 	"os"
 	"runtime"
+	"sync"
 	"syscall"
 	"unsafe"
 )
@@ -24,7 +25,14 @@ var (
 	procGlobalMemoryStatusEx = kernel32.NewProc("GlobalMemoryStatusEx")
 )
 
-type Reporter struct{}
+type Reporter struct {
+	mu sync.Mutex
+
+	lastIdle   uint64
+	lastKernel uint64
+	lastUser   uint64
+	hasSample  bool
+}
 
 func NewReporter() *Reporter {
 	return &Reporter{}