There ought be one for removal at the close of the session, and close of the server, and then perhaps again at startup, after somehow confirming that they aren't in use by another spritely process.
Concrete Requirements
[ ] remove at session close
[ ] remove at session new image
[ ] remove at spritely process close
[ ] remove unused/leftovers at new spritely process start
Summary
There ought be one for removal at the close of the session, and close of the server, and then perhaps again at startup, after somehow confirming that they aren't in use by another spritely process.
Concrete Requirements