Review follow-ups:
- The agents list and the pinned list dropped agents that had neither a
source nor a retriever. Publishing such an agent is now allowed, so it
vanished from the list right after publish. Both filters are gone; a
source-less agent skips retrieval and is still runnable. Tests cover
both listings.
- The agent form selected an uploaded source by diffing the source
catalog before and after the upload, which would also pick up any
source created or shared in the meantime. Upload now passes the id of
the source it created to onSuccessfulUpload, and the form selects only
that id.
Alex
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