docs(changelog): tag idle-gated reply-spin entry with PR #177

[TinDang97]

What

Add the (PR #177) tag to the "Lock-free cross-shard read recovery (idle-gated reply spin)" entry under [Unreleased] in CHANGELOG.md.

Why

It was the only v2-performance changelog entry missing its originating PR number. The sibling entries — WAL group commit (#178) and FT.SEARCH off-event-loop (#179) — both carry one. This makes all three v2-stack entries consistently attributable.

Scope

Documentation-only — a single-line heading change. No code, test, config, or behavior change. The CHANGELOG CI gate passes naturally (the file is touched).

Summary by CodeRabbit

• Chores
  • Updated changelog with additional PR reference information for release tracking purposes.

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 5ab6de1c-d0b0-4beb-bd1d-e8099542e804

📥 Commits

Reviewing files that changed from the base of the PR and between 9120c0a and e55f9f9.

📒 Files selected for processing (1)

• CHANGELOG.md

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📝 Walkthrough

Walkthrough

A single line in CHANGELOG.md is updated to append (PR #177) to the unreleased "Lock-free cross-shard read recovery (idle-gated reply spin)" performance subsection title.

Changes

Changelog PR Reference

Layer / File(s)	Summary
Add PR #177 reference to changelog entry CHANGELOG.md	The unreleased performance subsection header for lock-free cross-shard read recovery now includes (PR #177) in its title.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~1 minute

Poem

🐇 A tiny hop, a line rewritten,
The changelog glows, no longer smitten
with missing refs — PR one-seven-seven
now graces the log like stars in heaven.
hippity-hop, the rabbit smiles wide! 🌟

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: adding a PR reference tag to a changelog entry. It is concise, specific, and clearly conveys the primary modification.
Description check	✅ Passed	The description is mostly complete with a clear 'What' section explaining the change and a 'Why' section providing context. However, it lacks the required 'Summary', 'Checklist', 'Performance Impact', and 'Notes' sections specified in the template.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/changelog-pr177-tag

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