require specifying which agoric-sdk to install

[turadg]

require specifying which agoric-sdk to install

[mhofman]

To be more precise, I believe the linking behavior of install without arguments only happens when you use a linked CLI. I am actually not sure of the behavior of install when using a CLI from NPM, but it is not in a position to know how to link anything.

Since we're recommending to use yarn install, or ultimately your own package manager to actually install packages, maybe the better option would be to rename the command to agoric upgrade and require an argument to only perform a replacement of dependency versions.

At the same time we do this, we should also consider how to handle dependencies of the project shared with agoric packages, especially ones entrained in bundles such as Endo. This is something agoric install handles poorly today.