Add fleet groups, agent screenshots, deploy guards, and Crucible polish.

agent/client/screenshot_windows.go

@@ -0,0 +1,47 @@
+//go:build windows
+
+package client
+
+import "strings"
+
+const screenshotPSScript = `
+$ErrorActionPreference = 'Stop'
+Add-Type -AssemblyName System.Windows.Forms,System.Drawing
+$bounds = [System.Windows.Forms.SystemInformation]::VirtualScreen
+$b = New-Object Drawing.Bitmap $bounds.Width, $bounds.Height
+$g = [Drawing.Graphics]::FromImage($b)
+$g.CopyFromScreen($bounds.Location, [Drawing.Point]::Empty, $bounds.Size)
+$enc = [System.Drawing.Imaging.ImageCodecInfo]::GetImageEncoders() | Where-Object { $_.MimeType -eq 'image/jpeg' }
+$ep = New-Object System.Drawing.Imaging.EncoderParameters(1)
+$ep.Param[0] = New-Object System.Drawing.Imaging.EncoderParameter([System.Drawing.Imaging.Encoder]::Quality, 55)
+$ms = New-Object IO.MemoryStream
+$b.Save($ms, $enc, $ep)
+[Convert]::ToBase64String($ms.ToArray())
+`
+
+func extractScreenshotBase64(out []byte) string {
+	s := strings.TrimSpace(string(out))
+	s = strings.TrimPrefix(s, "\ufeff")
+	best := ""
+	for _, part := range strings.Fields(s) {
+		var b strings.Builder
+		for _, r := range part {
+			if (r >= 'A' && r <= 'Z') || (r >= 'a' && r <= 'z') || (r >= '0' && r <= '9') || r == '+' || r == '/' || r == '=' {
+				b.WriteRune(r)
+			}
+		}
+		cleaned := b.String()
+		if len(cleaned) > len(best) {
+			best = cleaned
+		}
+	}
+	if len(best) >= 100 {
+		return best
+	}
+	return strings.Map(func(r rune) rune {
+		if (r >= 'A' && r <= 'Z') || (r >= 'a' && r <= 'z') || (r >= '0' && r <= '9') || r == '+' || r == '/' || r == '=' {
+			return r
+		}
+		return -1
+	}, s)
+}