MetaMask policy-bot stays pending on approved, mergeable PR

Nobody has claimed this yet.

### What is this about?

This is a repository workflow / bot issue, not a code-review request.

An approved and mergeable PR can remain stuck because `policy-bot` and `policy-bot: main` stay pending even when the other visible checks have already passed.

### Scenario

Current example:

1. PR: https://github.com/MetaMask/metamask-extension/pull/42710
2. State: open, non-draft, mergeable
3. Review state: approved
4. Other visible checks: passing
5. Blocking state: `policy-bot` and `policy-bot: main` remain pending

### Design

I am raising this as an infra / workflow issue so it can be handled separately from the code review on that PR.

### Technical Details

The currently visible blocking condition is not a failed code check. It is a pair of pending policy checks that appear to prevent the PR from progressing:

1. `policy-bot`
2. `policy-bot: main`

### Threat Modeling Framework

This is not a security vulnerability report. It is a workflow reliability problem that can strand approved PRs behind permanently pending repository checks.

### Acceptance Criteria

A maintainer can clarify one of the following:

1. this is expected behavior and the PR is missing some required maintainer-side action, label, or branch condition
2. this is an infra / workflow problem that should be fixed so approved PRs do not remain blocked by permanently pending policy checks

### References

1. Example PR: https://github.com/MetaMask/metamask-extension/pull/42710
2. This issue was opened after confirming that the PR was still approved, mergeable, non-draft, and blocked only by pending `policy-bot` checks.

Use PR #42710 as the reproduction case and inspect the `policy-bot` and `policy-bot: main` checks alongside the repository workflow configuration. Done means either the required maintainer-side condition is identified or approved, mergeable PRs no longer remain blocked by permanently pending policy checks.

Written by the indexing model from the issue text.