feat(gpu): fix shutdown race, add RVN pool rotation, full test suite. Fix run() deadlock: proc.Kill() on Stop(), dedicated pollStop channel, stopCh checked in retry delay. Add buildPoolList() using RVNBackupPools (was wired in config/UI but unused). 29 new GPU tests covering detection gates, pool URL building, pool rotation, avg(), itoa(), zip extract, mock miner API (T-Rex + TRM), process stop. RVN wallet defaults set. Download URLs verified 200.

agent/client/gpu_detect_stub.go

@@ -23,25 +23,20 @@ func detectGPU() GPUInfo {
 	return GPUInfo{Vendor: GPUVendorNone}
 }
 
-func (g *GPUMiner) startProcess(binPath string) (*os.Process, error) {
-	pool := g.cfg.RVNPoolHost
-	port := g.cfg.RVNPoolPort
+func (g *GPUMiner) startProcessOnPool(binPath string, ep rvnEndpoint) (*os.Process, error) {
 	wallet := g.cfg.RVNWallet
 	worker := g.cfg.WorkerName
-
-	poolURL := "stratum+tcp://" + pool
-	if g.cfg.RVNPoolTLS {
-		poolURL = "stratum+ssl://" + pool
-	}
-	if port > 0 {
-		poolURL += ":" + itoa(port)
+	poolURL := buildPoolURL(ep)
+	pass := ep.pass
+	if pass == "" {
+		pass = "x"
 	}
 
 	args := []string{
 		"-a", "kawpow",
 		"-o", poolURL,
 		"-u", wallet + "." + worker,
-		"-p", g.cfg.RVNPoolPass,
+		"-p", pass,
 		"--api-bind-http", "127.0.0.1:4067",
 	}
 	cmd := exec.Command(binPath, args...)