Add Go worker agent prototype

coordinator/cmd/worker-agent/main.go

@@ -0,0 +1,26 @@
+// Command worker-agent is the Go worker agent: a coordinator client that
+// executes SDK workloads in a Python subprocess per claimed task.
+package main
+
+import (
+	"log/slog"
+	"os"
+
+	"github.com/emil28092005/SciMesh/coordinator/internal/agent"
+)
+
+func main() {
+	config, err := agent.LoadConfig()
+	if err != nil {
+		slog.Error("invalid configuration", "error", err)
+		os.Exit(2)
+	}
+	logger := slog.New(slog.NewTextHandler(os.Stderr, nil))
+	client := agent.NewClient(config.CoordinatorURL, config.Token, config.RequestTimeout)
+	runner := agent.NewTaskRunner(config.TaskRunner)
+	daemon := agent.NewDaemon(config, client, runner, logger)
+	if err := daemon.RunForever(); err != nil {
+		logger.Error("agent stopped", "error", err)
+		os.Exit(1)
+	}
+}