fix(net): a group-only reader subscribes to its replacement copy

doc/concept/moq-lite.md

@@ -57,6 +57,19 @@ a group at or past `SUBSCRIBE_END`, or a `SUBSCRIBE_END` below a group already
 received. moq-lite 05 specified an inclusive end, so there it only drops that
 group or the early boundary.
 
+## Group reads across failover
+
+Rust origin readers can keep reading an in-flight group after its source fails.
+A group reader waiting on a replacement copy subscribes to it from the frame it
+needs, even when the caller is not polling for the next group, and holds that
+subscription until the group ends. If that copy refuses the subscription, the
+read ends with an error. The copy's declared start says whether the group is
+still coming, so a newer group overtaking it on the wire does not end the wait.
+A copy that declares no start (a local track) and has advanced past the group
+ends the read with an error. This also applies when waiting for the group's
+completion; no FETCH is issued. A replacement that later drops the group it is
+serving still needs SUBSCRIBE\_DROP support to resolve that wait.
+
 ## Discovery
 
 A session can ask for announcements matching a path prefix. The peer replies

quest/m1/2991-net-coalesce-dynamic-tracks-and-preserve-sequences-across.md

@@ -89,5 +89,5 @@ the closed producer's cache or terminal state.
 
 ## Related
 
-- [Resume latest](/quest/m1/resume-latest.md) - edits `resume.rs` and its takeover tests (#4491)
+- [#4491](https://github.com/moq-dev/moq/pull/4491) - edits `resume.rs` and its takeover tests
 - [Parked reads wake](/quest/m1/parked-read-wakes.md) - edits the same `resume.rs` wakeups

quest/m1/README.md

@@ -40,7 +40,6 @@ QUIC studies there on that rule.
 - [web-transport-moq 1.3.3 ships noq#24](/quest/m1/web-transport-moq-release.md) - the release that carries the close-capsule fix
 - [WebTransport close upstream](/quest/m1/wt-close-upstream.md) - web-transport-moq delivers the close capsule itself, and moq-tokio's `CLOSE_LINGER` is deleted
 - [Browser close code](/quest/m1/browser-close-code.md) - a playwright case proves the page reads a relay's close code and reason, on every web-transport backend
-- [Resumed groups](/quest/m1/resume-latest.md) - a half-delivered group ends once the new copy is past it, so a group-only reader never parks after a mid-group failover
 - [Truncated groups fail finished()](/quest/m1/finished-truncated.md) - a spliced group whose continuation can never arrive fails `finished()` instead of reporting a clean end at the seam
 - [SUBSCRIBE_DROP](/quest/m1/subscribe-drop.md) - every stream group in a lite subscription arrives or is dropped by name, and lite-07 drops its stream count for it
 - [Late lower groups](/quest/m1/lite-late-lower-group.md) - a moq-lite subscriber with a floor receives a group created below the first served one, as moq-transport does

quest/m1/finished-truncated.md

@@ -34,4 +34,4 @@ Public API: behavior only (an error where `Ok` was returned). Wire: none.
 
 ## Related
 
-- [Resumed groups](/quest/m1/resume-latest.md) - same `poll_finished` subscription path
+- [#4491](https://github.com/moq-dev/moq/pull/4491) - the same `poll_finished` subscription path

quest/m1/parked-read-wakes.md

@@ -22,12 +22,9 @@ Follow-ups from [#4484](https://github.com/moq-dev/moq/pull/4484), which made
 Settled: one quest, since both are the same wakeup invariant in
 `rs/moq-net/src/model/track.rs` and `resume.rs`.
 
-Land after [resume latest](/quest/m1/resume-latest.md) (#4491), which edits
-the same `resume.rs` wakeups, and rebase onto it.
-
 Public API: none. Wire: none.
 
 ## Related
 
-- [Resume latest](/quest/m1/resume-latest.md) - edits the same `resume.rs` wakeups; lands first (#4491)
+- [#4491](https://github.com/moq-dev/moq/pull/4491) - a resumed group holds demand on its replacement copy in the same `resume.rs` wakeups
 - [#2991](/quest/m1/2991-net-coalesce-dynamic-tracks-and-preserve-sequences-across.md) - extends the `resume.rs` takeover tests

quest/m1/subscribe-drop.md

@@ -32,8 +32,8 @@ Decided:
 - Datagram groups stay best effort. A publisher counts a datagram as
   delivered, so a lost one leaves an uncovered hole that waits out the tail
   grace, as today.
-- A resumed group ([Resumed groups](/quest/m1/resume-latest.md)) that is the
-  new copy's latest ends with the DROP's error when the copy drops it.
+- A resumed group that is the new copy's latest ends with the DROP's error
+  when the copy drops it.
 - A dropped or aborted group is visible to readers, not silently skipped.
   #4533 found the Rust model releases an aborted group's sequence and skips it,
   so a truncated first object is indistinguishable from a group never sent.