revert: remove automated review guidance

[LANSGANBS]

Summary

• remove the automated Review section added to README
• restore the previous Code Review guidance in CONTRIBUTING.md
• replace the original release note with a note recording the rollback

Verification

• npm run release-note:check
• git diff --check
• confirmed README.md and CONTRIBUTING.md match their pre-docs: document automated review process #532 content

[Copilot]

🟡 Changes recommended

The new release-note fragment’s wording doesn’t fully reflect the rollback scope described in the PR summary and should be adjusted for consistency.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

This PR rolls back the automated-review guidance that was introduced in PR #532 by removing the related section from the root README, restoring the prior (maintainer-led) code review guidance in CONTRIBUTING, and updating release-note fragments to record the rollback.

Changes:

• Remove the “自动 Review 与合并” section from README.md.
• Restore the simpler maintainer-led Code Review bullets in CONTRIBUTING.md.
• Replace the previous release-note fragment with a new fragment describing the rollback.

File summaries

File	Description
README.md	Removes the automated-review guidance section from the contributor-facing README area.
CONTRIBUTING.md	Restores the prior, maintainer-led code review/merge guidance.
.release-notes/revert-auto-review-guidance.md	Adds a new release-note fragment intended to record the rollback.
.release-notes/docs-auto-review-guidance.md	Removes the prior release-note fragment that described the automated-review guidance addition.

Review details

• Files reviewed: 4/4 changed files
• Comments generated: 1
• Review effort level: Lite

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