fix(net): a relative start on an idle copy counts from the live feed

quest/m1/README.md

@@ -133,7 +133,6 @@ tracks, so per-group stats stop costing cluster announces.
 - [Encoders declare no reordering](/quest/m1/encoder-reorder.md) - moq-video encoders publish `reorder: 0`
 - [Rust resume checks compression](/quest/m1/resume-compress.md) - a same-epoch route copy with a different `compress` is refused instead of corrupting framing
 - [WebGPU on Safari](/quest/m1/webgpu-safari.md) - the WebGPU renderer is verified on Safari 26 for macOS and iOS
-- [Track live signal](/quest/m1/track-live.md) - a reader can wait for its track's feed to be live, so a player skips old cached groups while a fresh upstream subscription starts
 - [Producers drop the phantom catalog type](/quest/m1/catalog-phantom.md) - moq-video, moq-audio and moq-mux producers lose an `E: CatalogExt` parameter that only `PhantomData` holds
 - [JSON encoder options without a downcast](/quest/m1/json-encoder-options.md) - moq-mux's `json_snapshot` takes its `deltas` switch through a typed path any custom catalog entry can use, not an `Any` downcast
 - [CI housekeeping](/quest/m1/ci-housekeeping.md) - validate queue nextest at 24 threads and remove the actionlint queue ignore after its release

quest/m2/readers-range-live.md

@@ -29,4 +29,3 @@ Public API: none expected. Wire: none.
 ## Related
 
 - [Audio join budget](/quest/m2/audio-join-budget.md) - moq-audio's join at the latest group
-- [Track live signal](/quest/m1/track-live.md) - the fix this builds on

rs/moq-net/src/model/subscription.rs

@@ -109,7 +109,9 @@ pub enum Order {
 ///
 /// A relative or time anchor resolves at the hop that serves it, when it starts serving
 /// and again whenever the subscriber replaces its ranges. Before any group exists a
-/// relative anchor resolves at the first one, so [`Range::live`] starts there.
+/// relative anchor resolves at the first one, so [`Range::live`] starts there. A relay's
+/// copy waiting on a fresh upstream answer counts from the live feed's latest group once
+/// it answers, never from the groups an ended feed left in its cache.
 ///
 /// No published wire carries either yet: upstream, a relative or time start is no floor,
 /// the same request as [`Range::oldest`], and a relative or time end is no end. Behind a