quest(m1): plan the audio-quality and wire-compat follow-ups

quest/m1/README.md

@@ -78,6 +78,7 @@ above them, since the epoch anchor requires it.
 - [Live TS clock validation](/quest/m1/ts-live-clock.md) - resolve the local PCR-rate failure with reproducible timing evidence and CI controls
 - [Slow source fails](/quest/m1/slow-source.md) - an export whose source runs further off real time than the output may follow fails promptly naming the rate, instead of dropping frames for hours
 - [Same-instance TS resume](/quest/m1/ts-same-instance-resume.md) - prove valid continuation and fix the unexpected final exporter failure without weakening identity
+- [Wire compat media](/quest/m1/wire-compat-media.md) - wire-compat always runs same-version media cells through the compat reader, so planned breaks can't hide its regressions
 - [More tests under load](/quest/m1/test-flakes-2/README.md) - the second round of load-only failures, one quest per flake, fixed at the cause
 - [Plan: a public model](/quest/m1/model-public-surface.md) - every crate-private model item is made public or unnecessary, so a custom publisher or subscriber builds from the public model alone
 - [Lazy discovery](/quest/m1/lazy-discovery/README.md) - a `consume` session requests announcements only for prefixes the origin is watching, in JS then Rust; `follow`, `broadcasts`, and the `discovery` option go away

quest/m1/audio-jitter-target/README.md

@@ -36,6 +36,8 @@ the native decode path too, asserting the same target series the browser's
 
 ## Required
 
+- [AAC bursty re-stall](/quest/m1/audio-jitter-target/aac-bursty-restall.md) - AAC under bursty delivery plays without a re-stall loop
+- [Opus isolated-ring target](/quest/m1/audio-jitter-target/opus-isolated-target.md) - the isolated ring holds the target at near-zero jitter
 - [Watch](/quest/m1/audio-jitter-target/watch.md) - the browser's measured target, proven on Chrome and Safari against the public relay
 
 ## Closes

quest/m1/audio-jitter-target/aac-bursty-restall.md

@@ -0,0 +1,46 @@
+# [M] AAC under bursty delivery plays without a re-stall loop
+
+## Goal
+
+The browser player plays AAC under the `bursty` network profile without
+repeatedly running dry and refilling: the nightly audio-quality rows'
+`stalled_share`, skip-aheads, and discarded audio fall to what the Opus rows
+on the same profile show, on both the isolated and the postMessage ring paths.
+
+## Plan
+
+Measured by [#5442](https://github.com/moq-dev/moq/pull/5442) over the 7
+scheduled nightlies of 2026-10-07 to 2026-10-13: both AAC bursty rows stalled
+19 to 43% of the window every night, with about 17 skip-aheads a minute and
+about 2 s a minute of audio discarded. AAC wide stalled 6 to 12%. The
+budgets carry these numbers as measured so the job is green; this quest fixes
+the player and tightens them.
+
+Start after #5442 merges: it uploads the nightly artifacts and carries the
+measured budgets this quest tightens.
+
+Decided 2026-10-13 (maintainer): a child of the audio jitter target line,
+reproducible from the harness now, so Watch's manual proof runs after it.
+
+Reproduce before fixing. Start from the nightly's `audio-quality-run`
+artifacts (uploaded every run since #5442), then capture the case as a
+replay trace so the failure runs deterministically under
+`js/watch/src/audio/replay.ts` on a simulated clock. AAC's 1024-sample frames
+(23.2 ms at 44.1 kHz) against Opus's 20 ms are the first suspect: the
+estimator's frame term, the ring sizing, and the skip-ahead threshold each
+see frame duration. Watch already records that a ring running dry re-stalls
+and refills to the target; find why AAC under bursts keeps re-entering that
+loop. Fix the layer that is wrong, including `doc/concept/audio-jitter.md`
+and its conformance corpus if the estimator itself is at fault, mirrored in
+`rs/moq-audio`.
+
+Tighten the replay budget for the new trace and the AAC browser ceilings in
+`test/audio-quality/budgets.json` from re-measured nightly runs, with the
+reason in review.
+
+Public API: none expected. Wire: none.
+
+## Related
+
+- [Watch](/quest/m1/audio-jitter-target/watch.md) - the manual browser proof that follows this fix
+- [Opus isolated-ring target](/quest/m1/audio-jitter-target/opus-isolated-target.md) - the other defect the same measurement found

quest/m1/audio-jitter-target/opus-isolated-target.md

@@ -0,0 +1,41 @@
+# [S] The isolated ring holds the target at near-zero jitter
+
+## Goal
+
+On the `near-zero` network profile, Opus on the isolated (SharedArrayBuffer)
+ring settles at the same playout target as the postMessage ring, with no
+underrun episodes, in the nightly audio-quality rows.
+
+## Plan
+
+Measured by [#5442](https://github.com/moq-dev/moq/pull/5442) over the 7
+scheduled nightlies of 2026-10-07 to 2026-10-13: Opus near-zero on the
+isolated ring reached a `target_ms_p95` of 100 to 800 ms with underrun
+episodes of about 1 s, while the postMessage ring on the same profile held at
+60 ms. A network with almost no jitter should not grow the target, so the
+first suspect is the isolated page's path rather than the estimator.
+
+Start after #5442 merges: it uploads the nightly artifacts and carries the
+measured budgets this quest tightens.
+
+Decided 2026-10-13 (maintainer): a child of the audio jitter target line,
+reproducible from the harness now, so Watch's manual proof runs after it.
+
+Reproduce it first, from the nightly artifacts and then in
+`js/watch/src/audio/replay.ts` or a ring-level test on a simulated clock.
+The target and the underruns may have separate causes. The target follows
+`consumer.spread`, which `js/hang/src/container/consumer.ts` records from
+transport arrivals before the ring, so a ring defect cannot inflate it:
+compare the captured arrivals and configuration of the two rows first, for
+something on the cross-origin isolated page that delays when frames are
+observed. A ring that under-reports its fill, reads the worklet's position
+late, or misses a resize explains underruns only. Fix each at the source with
+a regression that fails without it, then tighten the isolated near-zero
+ceilings in `test/audio-quality/budgets.json` from re-measured nightly runs.
+
+Public API: none expected. Wire: none.
+
+## Related
+
+- [Watch](/quest/m1/audio-jitter-target/watch.md) - the manual browser proof that follows this fix
+- [AAC bursty re-stall](/quest/m1/audio-jitter-target/aac-bursty-restall.md) - the other defect the same measurement found

quest/m1/audio-jitter-target/watch.md

@@ -56,6 +56,11 @@ Decided 2026-10-08: moves to m1 with the rest of the line. The estimator
 defaults on and only this manual proof is left, so it no longer gates a
 release.
 
+## Required
+
+- [AAC bursty re-stall](/quest/m1/audio-jitter-target/aac-bursty-restall.md) - AAC under bursty delivery plays without a re-stall loop
+- [Opus isolated-ring target](/quest/m1/audio-jitter-target/opus-isolated-target.md) - the isolated ring holds the target at near-zero jitter
+
 ## Related
 
 - [A/V clock](/quest/m1/av-clock.md) - reshapes `SyncInput` around the per-track target this line produces

quest/m1/wire-compat-media.md

@@ -0,0 +1,39 @@
+# [S] Wire compatibility always exercises the compat reader's media path
+
+## Goal
+
+`just test wire-compat` runs at least one current-to-current and one
+released-to-released media cell through the compat reader
+(`test/interop/compat/client.ts`, selected by `INTEROP_COMPAT_CLIENT`), so a
+regression in that reader's media path fails the nightly even while planned
+breaks skip every cross-version media cell.
+
+## Plan
+
+Found on [#5444](https://github.com/moq-dev/moq/pull/5444): the
+`catalog-archive` planned break skips all 24 media cells until a release
+carries #4034, so the new reader's media path ran only by hand. A planned
+break is about a version pairing, so same-version cells are never covered by
+one and stay meaningful.
+
+Start after #5444 merges: it adds the reader's `subscribe` command and the
+`INTEROP_COMPAT_CLIENT` selector this quest relies on.
+
+Decided 2026-10-13 (maintainer): m1. Add the two control cells to the
+matrix in `test/interop/compat.sh` and `resolve.ts`, reusing the existing
+lanes rather than a new harness. Pick the lite version the released packages
+and binaries both negotiate. Prove each cell fails when the reader's media
+path is broken (for example, a reader that never decodes a frame), then
+restore it. Runs in the nightly Interop's wire-compat step; never dispatch the
+nightly on a branch.
+
+Rejected 2026-10-13: a separate tsc pass of the compat reader. `just js check`
+already typechecks `test/interop/compat/*.ts` against the checkout's packages
+through `test/tsconfig.json`, and running a released lane catches API the
+released packages lack.
+
+Public API: none. Wire: none.
+
+## Related
+
+- [#5444](https://github.com/moq-dev/moq/pull/5444) - the compat reader and the re-measured planned breaks