[WIP] Turn off Issue Monster for non-approved issues

[Copilot]

Plan: Restrict Issue Monster to AI-Generated Issues Only

• Modify issue-monster.md to require ai-generated label
  • Update the search query to include +label:"ai-generated"
  • Update excludeLabels logic and documentation
  • Update workflow description and instructions
• Recompile issue-monster.lock.yml
• Test the changes by verifying the workflow syntax
• Run make agent-finish for final validation

Original prompt

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This section details on the original issue you should resolve

<issue_title>Turn off Issue Monster except for issues generated by, say, "/plan"</issue_title>
<issue_description>Can we just turn off Issue Monster except for issues generated by, say, "/plan" please, via a label issue-monster-cookie or something?
It just doesn't look right that it triggers on human-contributed issues #11079
</issue_description>

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

@pelikhan Another strategy: ignore issues with assignees https://github.com//pull/11090 @dsyme Yeah that doesn't work because * 1P issue contributors forget to assign someone * 3P issue contributors would never assign someone (not even sure if they're allowed to)

Just turn off issue monster except for issues that are known to be approved work queue work in some way </comment_new>

• Fixes Turn off Issue Monster except for issues generated by, say, "/plan" #11086

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