dev.knotless.awaitSpaceWrites

The spaces written to since `cursor`, of the private repositories whose owners invited the caller (dev.knotless.inviteRunner), as their authorities told the appview (com.atproto.space.notifyWrite): nothing written in a space reaches the firehose. Answers as soon as there is one, or with none after a while, to be asked again from the cursor it gives. A write told of is only a reason to look: the caller reads the space itself, as a member. Requires a service token from the caller's PDS, audience the appview's DID, for this method.