chore: Add GitHub Actions workflow to automatically close linked issues upon merging pull requests into the dev branch.

.github/workflows/close-issue-on-dev.yml

@@ -0,0 +1,47 @@
+name: Auto Close Issue on Dev Merge
+
+on:
+  pull_request:
+    types: [closed]
+    branches:
+      - dev
+
+jobs:
+  close-linked-issue:
+    if: github.event.pull_request.merged == true
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+      pull-requests: read
+    steps:
+      - name: Close Issue
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const body = context.payload.pull_request.body;
+            const repo_owner = context.repo.owner;
+            const repo_name = context.repo.repo;
+
+            // Regex to find "closes #123", "fixes #123", etc.
+            const re = /(?:close|closes|closed|fix|fixes|fixed|resolve|resolves|resolved)\s+#(\d+)/gi;
+            let match;
+
+            while ((match = re.exec(body)) !== null) {
+              const issue_number = match[1];
+              console.log(`Found linked issue: ${issue_number}. Closing...`);
+
+              await github.rest.issues.update({
+                owner: repo_owner,
+                repo: repo_name,
+                issue_number: issue_number,
+                state: 'closed',
+                state_reason: 'completed'
+              });
+
+              await github.rest.issues.createComment({
+                owner: repo_owner,
+                repo: repo_name,
+                issue_number: issue_number,
+                body: `Closed automatically via PR #${context.payload.pull_request.number} merged into dev.`
+              });
+            }