[kixelated]

An external audit of publisher epochs and route failover found five issues. Three are already tracked. The other two are Rust same-epoch resume gaps that I confirmed on main (d4cdfe4), and this PR adds a quest for each.

Quests

• quest/m1/resume-compress.md [XS]: Front::track_info (rs/moq-net/src/model/front.rs) compares timescale, max age, and priority, but not compress. A compressed route can therefore be replaced by an uncompressed one under the same epoch, and a downstream reader then sees broken framing. JS already refuses this mismatch.
• quest/m1/resume-handed-out.md [S]: hand_out (rs/moq-net/src/model/resume.rs) records a group for backup retention only while copies overlap. That guard came from fix(net): keep a replaced route copy while a group it may carry is needed #6141. When a group was first read from a single route, the copy that later holds it is dropped, and the read waits out max_delay before failing. fix(net): end a resumed track the way a direct one ends #6136 fixes this in JS, but fix(net): retain resume bounds across route copies #6224 does not fix it in Rust. This quest is sequenced after resume-rust-end so it does not widen that PR.

Already tracked, left out

• Draft-17 joining FETCH loses the next group's head after recovery: fix(net): join pre-draft-20 subscriptions at the live group #6348, with coverage in test(net): cover lagging replicas on epoch wires #6232 (quest/m1/replica-resume.md).
• Resumed-track completion (group-only closed, declared end across swaps): fix(net): end a resumed track the way a direct one ends #6136 for JS and fix(net): retain resume bounds across route copies #6224 for Rust.
• Route flaps retaining redundant copies, and the sparse-window check: fix(net): retain resume bounds across route copies #6224.
• Cross-implementation clean finish: quest/m1/interop-finish.md.
• Lite-06 carrying no epoch, and same-publisher-only failover: already decided, and documented in doc/setup/upgrade.md and doc/bin/relay/cluster.md.

Dropped: browser publishing keeps linger: false as its default, so stopping a broadcast means stopping. refresh stays unchecked across copies on both sides, since it is a join heuristic and does not affect framing.

Decisions

Goal: Rust same-epoch resume closes the audit's two untracked gaps, and everything else stays with its existing quest or PR.

• ✅ Confirm
• Also revisit linger

Split:

• ✅ Two quests: [XS] compress, and [S] handed-out sequenced after fix(net): retain resume bounds across route copies #6224
• One quest
• Fold the handed-out fix into fix(net): retain resume bounds across route copies #6224

Milestone:

• ✅ m1
• m0

Recording handed-out groups:

• Every group
• ✅ Every group, plus a resume passthrough benchmark

Public API: none. Wire: none.

(Written by Claude Opus 5.5)

🤖 Generated with Claude Code

[coderabbitai]

Warning

Review limit reached

You've used all free OSS reviews for now. Wait for the free limit to reset to keep reviewing this public repository.

Next included review available in 2 minutes.

Check out review usage here.

View limit details

Limit details: You’ve used all 4 included reviews currently available.

Learn how review limits work.

Review configuration:

⚙️ Run configuration

• Source mode: Auto
• Repository: Unavailable
• Branch: Unavailable
• File: No configuration file from this repository applied
• Commit: Unavailable
• Layers: Organization UI
• Review profile: CHILL
• Plan: Advanced
• Run ID: c5c7c9d2-8672-4b3b-b9d9-7b1905f4d8af

📥 Commits

Reviewing files that changed from the base of the PR and between d4cdfe4 and 304fc1f.

📒 Files selected for processing: 3

• quest/m1/README.md
• quest/m1/resume-compress.md
• quest/m1/resume-handed-out.md

• Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-22T18:23:48.098214Z	304fc1f	PR opened

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review" or "@codex security review".

Codex reacts with 👀 while any review is running, comments if it has suggestions, and reacts with 👍 once all reviews finish with no findings.

[kixelated]

Ready to merge. This PR adds two m1 quests for Rust same-epoch resume gaps from the failover audit, confirmed on main:

• resume-compress [XS]: refuse a route copy whose compress differs.
• resume-handed-out [S]: record every handed-out group so a later copy that holds it is kept, with a passthrough benchmark. It is sequenced after fix(net): retain resume bounds across route copies #6224.

The maintainer settled every decision in the interview; the PR body lists each prompt. The Codex review found nothing. quest check passes against the current main.

(Written by Claude Opus 5.5)