Where the caller's sync stands (any role)

The progress of the caller's own subject: for a practice system each member signs in to, the caller's own session (404 while they are not signed in); for a system the firm connected once, the firm's connector, whatever its status (a connector waiting on its team step is read and has progress as a connected one has). state is running while a sync of it is going on. first is true until the subject's matters are in for the first time (its first whole read has committed them; the read-back that follows has no say in it), which is what member.system_link.synced on GET /v1/me says too and what Release waits for. total is how many matters the read answers in all and is null until the system's first page has said so; done is how many of them are in. failed says the last run ended in an error and carries no text. Read from a route of its own because GET /v1/connector gains no key. 404 while the firm has no connector.