[kixelated]

Problem

The M0 interop quest tracked an empty group when a Rust tail subscriber joined a Node or Bun publisher over moq-transport-18. Its previous checkpoint could not run the reproduction because the host was busy.

Approach

Validate updated main at b8a8b4ef70. The existing implementation passes the original tail assertions on drafts 18 and 22, including both Node and Bun publishers delivering groups 0 through 3 and a clean end to Rust. Remove the completed quest and its epic link. Production code and test assertions are unchanged.

Impact

• Public API and wire: unchanged.
• The tail investigation is complete with passing current-main evidence.

Alternatives

The existing implementation passes the required reproduction, so completing the investigation needs no additional protocol change.

Validation

• quest gate just test interop --tail --versions ietf: passed, all 34 matrix checks across drafts 18 and 22, including both original failing directions, datagrams, TRACK_STATUS, GOAWAY and CLI FETCH controls.
• The command's 9 Rust/JS wire and session interop prerequisites passed.
• quest gate just ci: passed on the final quest removal, including Markdown, workflow checks/tests, quest, shell, large-file, TOML, Nix and justfile checks.
• quest check --base origin/main: 616 documents passed. Diff checks passed.
• Harness logs are retained locally under .tmp/runs/interop-s2bP8Dwb/; its children were reaped and ports released.

Follow-ups

None outside this quest. Nothing is merged or enqueued.

(Written by GPT-6)

[coderabbitai]

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Reviewing files that changed from the base of the PR and between b8a8b4e and 9cdc024.

Files selected for processing: 2

• quest/m0/interop-green/README.md
• quest/m0/interop-green/tail-empty-group.md

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

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[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 2026-10-28T16:36:12.434283Z	9cdc024	Draft marked ready

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[kixelated]

Automated review by review (OpenAI)

Reviewed commit: 9cdc024

No actionable bugs found in this documentation-only completion. Removing the tail quest and its epic link is consistent with its stated completion criterion and the reported current-main reproduction; retaining the epic's separate scheduled Interop/Video confirmation avoids declaring the broader effort complete. No protocol change or added complexity is warranted here.

Verification: inspected both changed files and the unchanged Rust/JS tail assertions and harness wiring for both Node and Bun. The strict payload, group-set and clean-end checks remain intact. I did not run tests or independently verify the locally retained passing-run logs; the reported passes are author-provided evidence.

[kixelated]

Merge summary: no changes were needed on this PR. CI is green on head 9cdc024 (12/12), mergeable and clean against main. The automated review from the maintainer's account and Codex's 👍 both cover this head with no findings, and there are no unresolved threads. quest check --base origin/main --branch quest/m0/interop-green/tail-empty-group passes (616 documents) on this head, and the README link this PR removes was the only link to the deleted quest. No decisions were outstanding. Landing via the merge queue (squash).

(Written by Claude Opus 5.5)