I break into your property at your command, Just to help you make sure no one else can. Who am I?

I resemble a bedsheet, but I do not cover your bed. You can open and close me with me.

I farm clear stones in shallow beds; my fields wear rime when the cold sets. I never bake though I own many cups, twist my spine and watch my harvests jump.

I hold no life, yet I make others run, Two poles define me we work as one, Drain my power, and I’m simply done.

I have a mouth of many teeth, yet never bite or chew. I race along a narrow track, but never change my view. I keep your secrets close at night and guard your maps by day; Caught on myself I make you curse, then smooth the fuss away.