Hold 0039's page, its derived fourth number and its unpaged read

.github/coverage/pinned-surface

@@ -77,6 +77,7 @@ module  src/server/mod.rs           The server module and what it places at its
 module  src/server/address.rs       The address a person typed, parsed and refused where it is not usable.
 module  src/server/certificate.rs   The one exception 0029 admits to certificate validation: which certificate an operator pinned for which server, and what a pin never vouches for. A defect here accepts a certificate nobody asserted was theirs, or turns one server's key into something that can answer for a name the person never typed.
 module  src/server/federation.rs    Which second host a request may reach, and the deliberate act that admits one.
+module  src/server/library.rs       0039's answer shape: the offset and the count a paged read is asked for by, the three numbers an answer carries, and the read that takes neither. A defect here is a paging loop that stops after one screenful because a total the server filled in from the page was read as the size of a library, or a request for the second hundred views answered with the first hundred and nothing saying so.
 module  src/server/recovery.rs      0045's schedule for a server that is gone: when the next probe is due, where the doubling stops, and the hour after which the core stops asking. A defect here is a radio kept busy overnight on a device in somebody's bag, or a server that came back and was noticed hours later.
 module  src/server/transport.rs     The bounds every request is carried inside: which deadline an attempt runs against, how many may be outstanding against one server, how long an idle connection may be reused, and how far a cancelled body is read. A defect here is a request that outlives the deadline a caller was promised, or a connection handed back to an origin it was never opened to.
 module  src/server/write_queue.rs  0047's order, coalescing and bound for every write the core makes to a server. A defect here delivers somebody's actions out of the order they took them, keeps a queue that grows with activity rather than with breadth, or drops what a person just did instead of what they did three weeks ago.

src/lib.rs

@@ -139,8 +139,13 @@ const _: () = {
     any_thread::<diagnostics::redaction::FieldName>();
     any_thread::<diagnostics::redaction::CorrelatorSalt>();
     any_thread::<diagnostics::redaction::Correlator>();
-    any_thread::<server::QueryResult>();
     any_thread::<server::federation::Federation<'static>>();
+    any_thread::<server::library::PageRequest>();
+    any_thread::<server::library::WhatTheReadAnswers>();
+    any_thread::<server::library::LibraryRead>();
+    any_thread::<server::library::NotAPagedRead>();
+    any_thread::<server::library::WhatAskingForAPageDid>();
+    any_thread::<server::library::Page<()>>();
     any_thread::<server::certificate::Fingerprint>();
     any_thread::<server::certificate::PresentedChain<'static>>();
     any_thread::<server::certificate::Refused<'static>>();