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Lizards in the garden can actually be a good thing as they eat a number of insect pests. That being said, too many can also feed on your beloved plants or simply become a nuisance. If you have lizards in your garden, about the only safe control measure is to take away the reasons they are there in the first place - food and shelter. While the following article focuses on iguanas in the garden, the advice would also apply to most other types of lizards too, so you should find the info helpful: https://www.gardeningknowhow.com/plant-problems/pests/animals/iguana-control.htm

This article may help:
https://www.gardeningknowhow.com/plant-problems/pests/toad-control.htm

There is a good possibility that the bone meal is attracting the foxes. Since pepper has not deterred the foxes, I would suggest you try a sprinkling of human hair around the roots and even worked into the soil a bit. The next time your family members have their hair cut or trimmed, ask the stylist to save the hair clippings in a plastic bag for you. Then, sprinkle the clippings around the plants and partially into the soil as I suggested. Most animals will stay away from the scent of a human, and human hair is a good substance to use in conveying the human scent. I have tried this to discourage raccoons and squirrels, and it does work!

Here is a link for you.

https://www.gardeningknowhow.com/plant-problems/pests/animals/mole-control.htm

Other than keeping these bags in an area where the squirrels cannot access, like a building, shed, garage, etc., you could try placing them in storage containers. This article may also offer some suggestions for repelling these critters from the area: https://www.gardeningknowhow.com/plant-problems/pests/get-rid-squirrels.htm

To be on the safe side, it takes about a year for any pathogens that might have been in the cat feces to die off. Therefore, I would wait at least that long before turning it into a garden area, other than flowers. When you do get ready for planting, you may also want to consider solarizing the beds to kill off any possible pests/bacteria that may still be lurking about. This article will help with that: https://www.gardeningknowhow.com/garden-how-to/projects/how-to-solarize-garden-beds-to-eliminate-garden-pests-in-the-soil.htm

To help with future cat issues in the garden, here is an article that you may find helpful: https://www.gardeningknowhow.com/plant-problems/pests/cat-repellent.htm