quest: finish the FIRST_OBJECT backport

[kixelated]

Problem

#5069 landed the #5027 backport on release, which finishes quest/m0/release-22/first-object.md. The quest file only exists on main.

Approach

Delete the quest and drop it from the release-22 questline's Required list. quest check passes.

Impact

Quest files only. No code, public API, or wire change.

Follow-ups

• The OpenAI review of fix(net): accept a clear FIRST_OBJECT that starts at object 0 (backport #5027) #5069 noted the JS first-object peek in Subscriber.handleGroup (js/net/src/ietf/subscriber.ts) is not raced against unsubscribe. main has the same gap, as does the pre-existing first decodeMaybe before the group producer exists. Fix on main, then backport.

🤖 Generated with Claude Code

(Written by Claude Opus 5.5)

[kixelated]

MERGE

Reviewed head af6de2400aa5bd8df9c5c15d9bd157813f0cf3ad.

Quest-only cleanup after #5069 merged the #5027 FIRST_OBJECT backport onto release (Rust + JS). Claims check out: first-object.md is main-only (404 on release), #5069's own follow-up asked for this delete, and the only in-repo link to that file is the Required line this PR removes. Sibling quests (noq.md, location-filter.md) stay.

No blocking issues. No broken leftover links found. CI was still running at review time; expect green for quest-only.

Non-blocking: the release-22 README Goal/Plan still describe FIRST_OBJECT as work to carry in the cut. That remains true as product intent (already on release via #5069); only the checklist item needed to go. Optional polish later, not a reason to hold this.

This is an automated review, not the maintainer's decision
(Written by Grok)

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: Organization UI
• Review profile: CHILL
• Plan: Advanced
• Run ID: 5c5fc8f0-5f1f-471d-b0bb-bd79f00b6d13

📥 Commits

Reviewing files that changed from the base of the PR and between 6dd2930 and af6de24.

📒 Files selected for processing (2)

• quest/m0/release-22/README.md
• quest/m0/release-22/first-object.md

💤 Files with no reviewable changes (2)

• quest/m0/release-22/README.md
• quest/m0/release-22/first-object.md

Included review availability: This review used your included allowance. Your plan provides up to 4 included reviews per hour; 0 remain after this review.

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Walkthrough

The release-22 README no longer lists the FIRST_OBJECT backport as a required checklist item. The accompanying document describing the planned backport behavior and tests was deleted.

Priority: ⬇️ Low

Merge Risk: ⚪ Minimal · up to af6de

This change only removes a documentation checklist entry and its plan file. It doesn't change runtime behavior, and I found no merge-blocking risk.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check		The title clearly identifies that the pull request completes the FIRST_OBJECT backport. It matches the main change.
Description check		The description accurately explains the completed backport, deletion of the quest file, removal from the Required list, and the absence of code or API changes.
Docstring Coverage		No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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