Make assignee check explicit in auto-assign workflow

[Copilot]

The auto-assign workflow was not reliably filtering out issues that already have assignees due to vague natural language instructions.

Changes

• Explicit assignee filtering: Changed from passive "Has no assignees" to actionable instruction directing the AI agent to check the assignees field and skip issues where issue.assignees is not empty or has length > 0

Before/After

- Has no assignees
+ **Has no assignees** - When you retrieve issues from GitHub, explicitly check the `assignees` field. Skip any issue where `issue.assignees` is not empty or has length > 0.

Pattern aligns with similar workflows like issue-monster.md that successfully implement explicit assignee checking.

Original prompt

Update the auto-assign agentic workflow to ignore issues that already have assignees

Custom agent used: agentic-workflows
GitHub Agentic Workflows (gh-aw) - Create, debug, and upgrade AI-powered workflows with intelligent prompt routing

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