team/migration: A vote for joechenrh to be Migration reviewer

[GMHDBJD]

What changed

• Nominate joechenrh as a Migration Reviewer.
• Add joechenrh to the Migration reviewers list.
• Record the nomination rationale and contribution summary in a vote document.

Why

This supersedes #826. The previous nominator is not a Migration team member; this nomination is submitted by GMHDBJD, a current Migration committer.

Validation

• jq -e . teams/migration/membership.json
• git diff --check

[pingcap-cla-assistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[ti-chi-bot]

@D3Hunter: adding LGTM is restricted to approvers and reviewers in OWNERS files.

Details

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-08-14 07:19:23.261480551 +0000 UTC m=+3376549.297575617: ☑️ agreed by lance6716.

[kennytm]

LGTM but please sign the CLA.

Shall we close #826?

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: D3Hunter, kennytm, lance6716
Once this PR has been reviewed and has the lgtm label, please assign zhangyangyu for approval. For more information see the Code Review Process.
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Details

Needs approval from an approver in each of these files:

• teams/migration/OWNERS [kennytm,lance6716]
• votes/OWNERS

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