quest(m0): complete ts-duration-fidelity, fixed by #5292

quest/m0/README.md

@@ -59,8 +59,8 @@ Interop on main (2026-10-13): the cross-client matrix fails with `unroutable`
 whenever WebSocket wins the connect race: since #5294, #4180's upgrade
 retires epochless handles before its held `Restart` reaches anyone. The
 released wire-compat step aborts on planned breaks the last release made
-stale. Both stay in m0 (maintainer, 2026-10-13) and rank with TS duration
-fidelity: a red Interop hides real regressions.
+stale. Both stay in m0 (maintainer, 2026-10-13): a red Interop hides real
+regressions.
 
 Crashes (2026-10-13, #5407): a publisher on a host whose wall clock reads
 before 2020 panics, and `panic = "abort"` turns any library panic into a
@@ -78,7 +78,6 @@ have fixes on `main`: macOS tests (#5335), drill-sensitivity (#5338), loom
 ## Required
 
 - [Draft-22 media on 0.17](/quest/m0/release-22/README.md) - a 0.17.x with the LOCATION_FILTER and FIRST_OBJECT fixes and moq-noq 1.3.5, then draft-20+ FETCH
-- [TS duration fidelity](/quest/m0/ts-duration-fidelity.md) - Interop's TS compliance captures the whole round-tripped stream again, fixing a regression that turns Interop red on main
 - [Upgrade restarts epochless broadcasts](/quest/m0/upgrade-unroutable.md) - a WebSocket-to-QUIC upgrade retires epochless handles only once their `Restart` is delivered, and first-party consumers follow it, fixing Interop's `unroutable` rounds
 - [Unset host clock](/quest/m0/wall-clock-omit.md) - a publisher whose wall clock reads before 2020 publishes without a catalog clock instead of panicking
 - [Panic isolation](/quest/m0/panic-isolation.md) - unwind, ignore lock poison, and supervise every task, so a panic closes only its connection or exits on a long-lived task

quest/m1/ts-reliability/validation.md

@@ -65,7 +65,6 @@ controls have CI invocations too.
 
 ## Related
 
-- [TS duration fidelity](/quest/m0/ts-duration-fidelity.md) - fixes the base capture regression without weakening the duration assertion
 - [T-STD controls](/quest/m2/tstd-controls.md) - MB and AAC positive/negative coverage
 - [PSI system buffer](/quest/m1/tstd/psi-runs.md) - system-buffer proof belongs with the PSI fix
 - [Open-GOP leading pictures](/quest/m1/open-gop-leading-pictures.md) - acquisition trims change the decoder oracle

quest/m1/ts-same-instance-resume.md

@@ -62,4 +62,3 @@ required behavior or API change returns to the maintainer for a decision.
 - [Replacement catalog linger #5305](https://github.com/moq-dev/moq/pull/5305) - owns the bound on a mid-stream switch's first catalog
 - [Same-epoch importers](/quest/m1/hop-aligned-import.md) - shared catalogs, tracks and source-derived group identity
 - [Closed fallback #5284](https://github.com/moq-dev/moq/pull/5284) - early WebSocket closure and its transport-test fix
-- [TS duration fidelity](/quest/m0/ts-duration-fidelity.md) - diagnose a shared end-of-stream cause only if reproduced

test/ts/compliance.py

@@ -1242,9 +1242,11 @@ def check_duration_fidelity(captured_s: float, reference_s: float) -> Check:
     Every timing check above reads the stream's own PCR, so a PCR emitted on the
     wrong clock rate stays internally consistent and passes them all. Comparing
     the exported PCR span against the source's independent duration is the one
-    check that pins the absolute rate. Keyframe alignment drops up to a GOP of
-    lead, so the captured span runs a shade short, never materially long; the
-    band is wide enough to ignore that yet catch a gross scale error.
+    check that pins the absolute rate. The exporter joins at the live edge once
+    the catalog appears, and import holds the catalog for its two-second mux-rate
+    window, so the captured span runs up to that window plus a GOP short, never
+    materially long; the band is wide enough to ignore that yet catch a gross
+    scale error.
     """
     metrics = {"captured_s": round(captured_s, 2), "reference_s": round(reference_s, 2)}
     if reference_s <= 0: