add retry logic to openrgb commands for boot-time stability

OpenRGB can crash (SIGABRT) during early boot when device enumeration
hasn't completed yet. Retry failed commands up to 4 times with a
3-second delay to let initialization finish.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

controller/openrgb/client.go

@@ -2,7 +2,14 @@ package openrgb
 
 import (
 	"fmt"
+	"log"
 	"os/exec"
+	"time"
+)
+
+const (
+	maxRetries = 4
+	retryDelay = 3 * time.Second
 )
 
 // Client controls RGB devices via the openrgb CLI.
@@ -29,21 +36,33 @@ func (c *Client) Close() error {
 	return nil
 }
 
+// run executes an openrgb command with retries to handle transient failures
+// during early boot when device enumeration may not be complete.
+func (c *Client) run(args ...string) error {
+	var lastErr error
+	for attempt := range maxRetries {
+		cmd := exec.Command(c.bin, args...)
+		out, err := cmd.CombinedOutput()
+		if err == nil {
+			return nil
+		}
+		lastErr = fmt.Errorf("openrgb %v: %w\n%s", args, err, out)
+		if attempt < maxRetries-1 {
+			log.Printf("openrgb command failed (attempt %d/%d), retrying in %v: %v",
+				attempt+1, maxRetries, retryDelay, lastErr)
+			time.Sleep(retryDelay)
+		}
+	}
+	return lastErr
+}
+
 // SetAllOff sets all devices to black (off) using direct mode.
 func (c *Client) SetAllOff() error {
-	cmd := exec.Command(c.bin, "--mode", "direct", "--color", "000000")
-	if out, err := cmd.CombinedOutput(); err != nil {
-		return fmt.Errorf("openrgb set off: %w\n%s", err, out)
-	}
-	return nil
+	return c.run("--mode", "direct", "--color", "000000")
 }
 
 // SetAllOn sets all devices to the given color.
 func (c *Client) SetAllOn(r, g, b byte) error {
 	color := fmt.Sprintf("%02X%02X%02X", r, g, b)
-	cmd := exec.Command(c.bin, "--mode", "direct", "--color", color)
-	if out, err := cmd.CombinedOutput(); err != nil {
-		return fmt.Errorf("openrgb set on: %w\n%s", err, out)
-	}
-	return nil
+	return c.run("--mode", "direct", "--color", color)
 }