Leaves well rotted coffee grounds etc

If they are partially rotted i would put in the composter now to make compost for later.

With newly-fallen leaves, I mulch and bag them with a bagging lawn mower. That mateial makes a good mulch, and mats down a bit so there are fewer places for slugs to hide.

I would only dig in leaves if you are also digging in a nitrogen-containing fertilizer at the same time. Leaves need nitrogen to break down. The nitrogen used in decomposition will be released back to the soil at some point, but will temporarily be less available to plants.

Coffee ground don’t do much in my experience also don’t add too many it one shot the make soil acidic if I remember correctly just and a few handful like you would blood fish and bone still good for you soil though as is all organic matter

I personally would use the rotted leaves for something else, my own seed compost maybe, or I’ve just used a load to mix through with a bag of peat free compost & my own made compost plus blood, fish & bone to pot up strawberries into hanging baskets, some for the tunnel & some to hang in the fruit cage. I’m hoping it will be ok .
I just put the fresh leaves in a wire mesh container to rot down, then about once a year tip it out & mix it up a bit as the top ones don’t rot so well.
If yours is well rotted it shouldn’t harbour slugs any more than your cow manure or soil will. Slugs are attracted to wet hidey holes & unrotted mulches as a source of food.

There’s evidence coffee grounds suppress growth, unless they are well rotted down.