Add mcp route command for managing mc-proxy routes

New top-level command with list, add, remove subcommands. Supports
-n/--node to target a specific node. Adds AddProxyRoute and
RemoveProxyRoute RPCs to the agent. Moves route listing from
mcp node routes to mcp route list.

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

internal/agent/proxy.go

@@ -56,6 +56,22 @@ func (p *ProxyRouter) GetStatus(ctx context.Context) (*mcproxy.Status, error) {
 	return p.client.GetStatus(ctx)
 }
 
+// AddRoute adds a single route to mc-proxy.
+func (p *ProxyRouter) AddRoute(ctx context.Context, listenerAddr string, route mcproxy.Route) error {
+	if p == nil {
+		return fmt.Errorf("mc-proxy not configured")
+	}
+	return p.client.AddRoute(ctx, listenerAddr, route)
+}
+
+// RemoveRoute removes a single route from mc-proxy.
+func (p *ProxyRouter) RemoveRoute(ctx context.Context, listenerAddr, hostname string) error {
+	if p == nil {
+		return fmt.Errorf("mc-proxy not configured")
+	}
+	return p.client.RemoveRoute(ctx, listenerAddr, hostname)
+}
+
 // RegisterRoutes registers all routes for a service component with mc-proxy.
 // It uses the assigned host ports from the registry.
 func (p *ProxyRouter) RegisterRoutes(ctx context.Context, serviceName string, routes []registry.Route, hostPorts map[string]int) error {