Add workflow to sweep for stale issues

.github/workflows/devin-stale-issue-sweep.yml

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+name: Devin AI Stale Issue Sweep
+
+on:
+  schedule:
+    # Run daily at 9 AM America/Chicago (14:00 UTC)
+    - cron: '0 14 * * *'
+  workflow_dispatch: # Allow manual triggering
+
+jobs:
+  devin-analysis:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Trigger Devin AI Stale Issue Analysis
+        env:
+          DEVIN_API_KEY: ${{ secrets.DEVIN_API_KEY }}
+          PROMPT: |
+            **Task: Identify and Report Stale GitHub Issues**
+
+            Please analyze the PrefectHQ/prefect repository and identify the top 5 stale issues that could potentially be closed.
+
+            **Instructions:**
+
+            1. **Analyze Issues for Staleness:**
+               Consider an issue stale if:
+               - No activity (comments, updates) for 90+ days
+               - The issue describes a bug that appears to be fixed in recent commits
+               - The feature/enhancement is no longer relevant due to architectural changes
+               - The issue is a duplicate of another resolved issue
+               - The issue lacks sufficient information and has not been updated
+
+            2. **Prioritize Issues:**
+               - Rank by likelihood of being closable
+               - Focus on older issues first
+               - Verify the issue status by checking:
+                 * Recent commit history
+                 * Related PRs
+                 * Code changes that may have resolved the issue
+
+            3. **Select Top 5 Issues:**
+               Choose the 5 most clearly stale issues.
+
+            4. **Summary Findings**
+               - Format a message with:
+                 * Issue number and title
+                 * Link to the issue
+                 * Brief explanation (2-3 sentences) of why it appears stale
+                 * Recommendation (close, needs verification, etc.)
+               - Use clear formatting (markdown/blocks) for readability
+
+            **Expected Output:**
+
+            A message with this structure:
+
+            ```
+            🧹 Daily Stale Issue Report - [Date]
+
+            Found 5 potentially stale issues:
+
+            1. Issue #XXXX: [Title]
+               Link: https://github.com/PrefectHQ/prefect/issues/XXXX
+               Reason: [Why it appears stale]
+               Recommendation: [Action to take]
+
+            2. Issue #YYYY: [Title]
+               ...
+
+            [Continue for all 5 issues]
+
+            ---
+            Generated by Devin AI • Session: [session_id]
+            ```
+
+            **Important Notes:**
+            - Start with older issues first
+            - Do NOT close issues automatically - only report them
+            - Be conservative - when in doubt, do not flag the issue as stale
+            - Check for recent activity even if not visible in comments (commits, linked PRs)
+            - Respect issue labels like "pinned", "good first issue", "help wanted"
+        run: |
+          ESCAPED_PROMPT=$(echo "$PROMPT" | jq -Rs .)
+          # Create Devin session to analyze stale issues
+          RESPONSE=$(curl -X POST https://api.devin.ai/v1/sessions \
+            -H "Authorization: Bearer $DEVIN_API_KEY" \
+            -H "Content-Type: application/json" \
+            -d "{\"prompt\": $ESCAPED_PROMPT}" \
+
+          # Extract and display session information
+          SESSION_ID=$(echo "$RESPONSE" | jq -r '.session_id // empty')
+          SESSION_URL=$(echo "$RESPONSE" | jq -r '.session_url // empty')
+
+          if [ -n "$SESSION_ID" ]; then
+            echo "✅ Devin AI session created successfully"
+            echo "Session ID: $SESSION_ID"
+            echo "Session URL: $SESSION_URL"
+          else
+            echo "❌ Failed to create Devin AI session"
+            echo "Response: $RESPONSE"
+            exit 1
+          fi