host daemon touches (#4)

* feat: launch config tests

* feat: readiness probe port alignment

internal/daemon/readiness.go

@@ -0,0 +1,52 @@
+package daemon
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"strconv"
+	"strings"
+	"time"
+
+	contracthost "github.com/getcompanion-ai/computer-host/contract"
+)
+
+func waitForGuestReady(ctx context.Context, host string, ports []contracthost.MachinePort) error {
+	host = strings.TrimSpace(host)
+	if host == "" {
+		return fmt.Errorf("guest runtime host is required")
+	}
+
+	waitContext, cancel := context.WithTimeout(ctx, defaultGuestReadyTimeout)
+	defer cancel()
+
+	for _, port := range ports {
+		if err := waitForGuestPort(waitContext, host, port); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func waitForGuestPort(ctx context.Context, host string, port contracthost.MachinePort) error {
+	address := net.JoinHostPort(host, strconv.Itoa(int(port.Port)))
+	dialer := net.Dialer{Timeout: defaultGuestDialTimeout}
+	ticker := time.NewTicker(defaultGuestReadyPollInterval)
+	defer ticker.Stop()
+
+	var lastErr error
+	for {
+		connection, err := dialer.DialContext(ctx, string(port.Protocol), address)
+		if err == nil {
+			_ = connection.Close()
+			return nil
+		}
+		lastErr = err
+
+		select {
+		case <-ctx.Done():
+			return fmt.Errorf("wait for guest port %q on %s: %w (last_err=%v)", port.Name, address, ctx.Err(), lastErr)
+		case <-ticker.C:
+		}
+	}
+}