Exempt GitHub Copilot PRs from issue link requirement

[Copilot]

Description

This PR updates the enforce-issue-linked-pr.yml workflow to exempt PRs created by GitHub Copilot from the requirement of linking to an open issue via the Development section.

Problem

GitHub Copilot creates automated PRs using the copilot-swe-agent[bot] account. These PRs were being automatically closed by the workflow because they don't reference open issues in the Development section, which triggered the error message:

🚨 Missing Open Issue Link

This pull request does not reference any open GitHub issue via the Development section.

This prevented Copilot from autonomously creating and submitting PRs for issue resolution.

Solution

Added copilot-swe-agent[bot] to the exemptUsers array in the workflow, following the same pattern already established for the user A1L13N. This allows Copilot PRs to bypass the issue link validation while maintaining the requirement for all other contributors.

Changes

• Updated .github/workflows/enforce-issue-linked-pr.yml line 28
• Changed const exemptUsers = ['A1L13N']; to const exemptUsers = ['A1L13N', 'copilot-swe-agent[bot]'];

Testing

• Validated YAML syntax
• Verified the exemption follows existing patterns in the workflow
• Confirmed the bot username matches GitHub Copilot's account identifier

Fixes #674

Original prompt

---

This section details on the original issue you should resolve

<issue_title>remove requirement for open issue links for copilot PRs</issue_title>
<issue_description>## 🚨 Missing Open Issue Link

This pull request does not reference any open GitHub issue via the Development section.

PRs must be linked to an open issue using GitHub’s "Development" section (on the right sidebar).

How to fix this:

• Go to the PR page.
• Use the "Link issue" option in the Development section.
• Select an appropriate open issue.

This PR will be automatically closed. You can reopen it after linking an open issue.

Thank you!

Originally posted by @github-actions[bot] in #674 (comment)
</issue_description>

<agent_instructions>please update the action </agent_instructions>

Comments on the Issue (you are @copilot in this section)

Fixes #676

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