Use the closest COGS project for all operations

[beckyjackson]

If you cogs init a new project in the child directory of an existing COGS project, and then perform cogs push, the changes will be pushed to the parent COGS project.

COGS operations should always occur on the lowest-level .cogs directory found.

[jamesaoverton]

I think we're on the same page, but instead of "lowest-level" I would say "closest" directory, I guess, as in "the closest ancestor directory". So COGS should do the minimum amount of climbing necessary to find a .cogs/ directory.