[kixelated]

Imports issue #6062 (the only open issue without the quest label) as a quest. This PR mentions the issue but doesn't close it; the quest's PR will.

Triage

Read against 5284d969bf; nothing was run.

• Resume already asks for the right group. On a same-epoch swap, Reader::sync subscribes the new copy at the newest group it handed out (model/resume.rs), and a cold relay forwards that start upstream.
• Max age is what drops the frames. Every hop then applies the subscriber's max age (--delay / 2 for export ts) to the backlog that builds while the QUIC idle timeout detects the dead relay. The draft requires this ("A floor is not a request"). At the default delay, the reported loss is intended.
• --delay 10s is unexplained. The code predicts about 2 s lost there, but the report saw the same loss as at the default. That needs a reproduction.
• fix(net): read lower buffered groups across route copies #6019 and fix(net): let resumed subscriber forks follow route swaps #6024 don't cover this. Neither fix(net): read lower buffered groups across route copies #6019 nor fix(net): let resumed subscriber forks follow route swaps #6024 touches this path.
• The docs overclaim. doc/concept/moq-lite.md and the broadcast-epoch Goal promise resume "from the first frame it lacks" without mentioning the max-age bound.

Changes

• New quest/m1/resume-outage.md [S], ranked in m1's resume cluster after "Resumed in-flight groups". It adds a mock-time route_change.rs regression test with a cold alternate route and an undetected outage, fixes any bug the test exposes in moq-net, and corrects the concept doc.
• quest/m0/broadcast-epoch/README.md: the Goal now says a same-epoch resume is bounded by the subscriber's max age.
• quest/m2/route-health/{README,design,recovery}.md: a route that dies without a close counts as the stall that transport failure misses until the idle timeout fires. Recovery should move off it before the timeout.

Decisions

What should the quest deliver?

• ✅ Repro test + doc fix (recommended)
• Doc fix only, close
• Recover the whole gap regardless of max age
• Won't fix

Should faster dead-route detection get planned work?

• No, operator tuning (recommended)
• ✅ Extend route-health
• New quest: defaults

Milestone?

• ✅ m1 standalone (recommended)
• m0 broadcast-epoch child
• m2

Test scope?

• ✅ Model-level only (recommended)
• Model + e2e relay
• E2E only

How should route-health absorb the undetected loss?

• ✅ Count it as the gate stall (recommended)
• New route-health child
• Note in recovery.md only

m1 rank?

• ✅ In the resume cluster (recommended)
• Ahead of the resume cluster
• End of m1 feature list

Broadcast-epoch wording?

• ✅ Fix it in this PR (recommended)
• Leave it to the quest

Public API and wire impact: none. This PR only changes quests.

quest check passes.

(Written by Claude Opus 5.5)

🤖 Generated with Claude Code

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📒 Files selected for processing: 6

• quest/m0/broadcast-epoch/README.md
• quest/m1/README.md
• quest/m1/resume-outage.md
• quest/m2/route-health/README.md
• quest/m2/route-health/design.md
• quest/m2/route-health/recovery.md

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[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-20T16:50:06.571601Z	f4cbd6f	New commits

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[chatgpt-codex-connector]

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Reviewed commit: 60cedfedde

ℹ️ About Codex in GitHub

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[kixelated]

Summary before merge:

• Plans quest/m1/resume-outage.md for Same-epoch resume after a relay loss continues at a later group, not the first frame lacked #6062. Resume already asks for the first missing group; the subscriber's max age sheds the backlog that builds while the idle timeout detects the dead relay. The quest adds a mock-time regression test in moq-net, plus a moq-mux consumer test if moq-net passes, so the unexplained --delay 10s loss gets explained or fixed at its source. It also corrects the concept doc.
• The broadcast-epoch Goal now says a same-epoch resume is bounded by the subscriber's max age.
• Route health counts a route that dies without a close as the stall it must first reproduce, and should fail over before the idle timeout fires.

The decisions are listed in the PR description. Codex's one finding (cover the exporter consumer) was addressed in 64e48f1.

(Written by Claude Opus 5.5)