Add issue manager agent with stale issue cleanup skill

[Craig Alvord (craxal)]

Adds an agent for managing issues and a skill for handling issues that have not gotten responses from the community for some time. Also adds a workflow for running the agent periodically.

[Copilot]

Pull request overview

Adds GitHub “Agency” automation to manage stale bug issues in microsoft/AzureStorageExplorer by introducing a scheduled workflow, an issue-manager agent definition, and a detailed stale-issue-cleanup skill playbook.

Changes:

• Added a scheduled + manual GitHub Actions workflow to run an issue cleanup agent and upload its session log.
• Introduced an issue-manager agent definition for issue hygiene tasks.
• Added a stale-issue-cleanup skill describing how to identify and close stale bug issues (including project field updates).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 7 comments.

File	Description
.github/workflows/stale-issue-cleanup.yml	Schedules and runs the issue manager agent and uploads the resulting log artifact.
.github/skills/stale-issue-cleanup/SKILL.md	Defines the operational procedure for identifying and closing stale bug issues.
.github/agents/issue-manager.agent.md	Defines the issue manager agent role and points to available skills.

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[Craig Alvord (craxal)]

Copilot Review updates and replies to comments.

[Copilot]

Craig Alvord (@craxal) I've opened a new pull request, #8938, to work on those changes. Once the pull request is ready, I'll request review from you.

[Craig Alvord (craxal)]

Copilot I did not ask you to open a new PR. I have addressed your comments in this PR. I want you to review the current changes in this PR.

[Copilot]

Craig Alvord (@craxal) I've opened a new pull request, #8939, to work on those changes. Once the pull request is ready, I'll request review from you.

[Brandon Waterloo [MSFT] (bwateratmsft)]

Craig Alvord (@craxal) you could also use the one we use with the VSCode Azure extensions, originally written by the VSCode team for their repo. Up to you of course.

[Richard Gao (richardMSFT)]

Potentially could be a good idea to test this automation gradually. Maybe like a "staged rollout", where we first run in “dry run” mode for now, until we are confident that this process is fairly deterministic and the agent behaves as intended, and then let it actually close issues.

If you're confident that the agent is safe however, then I'm ok with trying it out as is.

[Craig Alvord (craxal)]

The agent is fairly conservative. And it logs which items it closes, so we can review and refine over time.