Added stale PR workflow (#347)

* added stale PR workflow to automatically manage inactive pull requests

* removed 🔄 changes required

* Changed days-before-pr-close: 14 -> -1 , Removed close-pr-message

* added auto-assign Closes #360

* adding back requirement.txt

Author: AR21SM

.github/workflows/auto_assign.yml

@@ -0,0 +1,26 @@
+name: Auto-assign Issue on First PR
+
+on:
+  pull_request:
+    types: [opened]
+
+jobs:
+  auto-assign:
+    runs-on: ubuntu-latest
+    
+    steps:
+      - name: Auto-assign issue to PR creator
+        uses: kentaro-m/[email protected]
+        with:
+          repo-token: "${{ secrets.GITHUB_TOKEN }}"
+          configuration: |
+            
+            addAssignees:
+              author: true  # Add the PR author as assignee to the linked issue
+              
+            addReviewers:
+              author: false # Don't add reviewers to PRs
+
+            skipIfAssigneesSet: true  # Skip if issue already has assignees (ensures only first PR gets assigned)
+
+        

.github/workflows/stale-pr.yml

@@ -0,0 +1,37 @@
+name: Mark stale pull requests
+
+on:
+  schedule:
+    - cron: '0 0 * * *'  
+  workflow_dispatch:      # Allow manual triggering
+
+permissions:
+  pull-requests: write
+  issues: read
+  contents: read
+
+jobs:
+  stale-pr:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v9
+        with:
+          # Disable for issues
+          days-before-issue-stale: -1
+          days-before-issue-close: -1
+          
+          days-before-pr-stale: 30
+          days-before-pr-close: -1
+          stale-pr-message: 'This pull request has been inactive for 30 days. It will be closed in 14 days if no further activity occurs.'
+          stale-pr-label: '⌛ stale'
+          exempt-pr-labels: ✨ content enhancement,✍️ new content'
+          exempt-draft-pr: true
+          delete-branch: false
+          
+          only-pr-labels: ''  # Process all PRs
+          
+
+          operations-per-run: 30
+          enable-statistics: true
+
+          exempt-all-pr-milestones: true