ci: add AI issue reviewer

.github/prompts/bug-assessment.prompt.yml

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+system: |
+  You are an AI assistant helping to triage bug reports for the Deno project.
+  Analyze the issue and provide a brief assessment.
+
+user: |
+  Please analyze this bug report and provide an assessment:
+
+  Issue body:
+  {issue_body}
+
+  Provide your assessment in the following format:
+
+  ### Assessment:
+  [Your assessment here - including severity, clarity, reproducibility, and any missing information]
+
+  ### Suggested Labels:
+  [Suggested labels like: needs-triage, needs-reproduction, critical, etc.]
+
+  Keep your response concise and actionable.

.github/prompts/feature-assessment.prompt.yml

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+system: |
+  You are an AI assistant helping to triage feature requests for the Deno project.
+  Analyze the issue and provide a brief assessment.
+
+user: |
+  Please analyze this feature request and provide an assessment:
+
+  Issue body:
+  {issue_body}
+
+  Provide your assessment in the following format:
+
+  ### Assessment:
+  [Your assessment here - including clarity of the proposal, potential impact, alignment with Deno's goals, and any missing details]
+
+  ### Suggested Labels:
+  [Suggested labels like: needs-discussion, enhancement, good-first-issue, etc.]
+
+  Keep your response concise and actionable.

.github/prompts/question-assessment.prompt.yml

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+system: |
+  You are an AI assistant helping to triage questions for the Deno project.
+  Analyze the issue and provide a brief assessment.
+
+user: |
+  Please analyze this question and provide an assessment:
+
+  Issue body:
+  {issue_body}
+
+  Provide your assessment in the following format:
+
+  ### Assessment:
+  [Your assessment here - including whether this is a usage question, documentation request, or potential bug. Note if it should be redirected to Discord/Stack Overflow]
+
+  ### Suggested Labels:
+  [Suggested labels like: question, documentation, redirect-to-discord, etc.]
+
+  Keep your response concise and actionable.

.github/workflows/issue_ai_review.yml

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+name: 'AI Issue Review'
+
+on:
+  issues:
+    types:
+      - opened
+
+# This workflow reviews new issues from external contributors using AI
+jobs:
+  ai-review:
+    name: AI review for external issues
+    runs-on: ubuntu-latest
+    # Only run for issues from users outside the denoland organization
+    if: github.event.issue.author_association != 'MEMBER' && github.event.issue.author_association != 'OWNER'
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Run AI Assessment
+        uses: github/[email protected]
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          issue_number: ${{ github.event.issue.number }}
+          issue_body: ${{ github.event.issue.body }}
+          ai_review_label: 'ai-reviewed'
+          prompts_directory: './.github/prompts'
+          labels_to_prompts_mapping: 'bug,bug-assessment.prompt.yml|enhancement,feature-assessment.prompt.yml|question,question-assessment.prompt.yml'
+          model: openai/gpt-4o-mini
+          max_tokens: 500