fix: remove dead step and paginate comment listing

- Remove unused "Determine VSIX filename" step whose outputs were never consumed
- Replace listComments with github.paginate to handle PRs with 30+ comments

.github/pr-build.yml

@@ -26,14 +26,6 @@ jobs:
       - name: Build VSIX
         run: pnpm vsix
 
-      - name: Determine VSIX filename
-        id: vsix
-        run: |
-          VSIX_FILE=$(ls bin/*.vsix | head -n1)
-          VSIX_NAME=$(basename "$VSIX_FILE")
-          echo "file=$VSIX_FILE" >> "$GITHUB_OUTPUT"
-          echo "name=$VSIX_NAME" >> "$GITHUB_OUTPUT"
-
       - name: Upload Regular VSIX
         uses: actions/upload-artifact@v4
         with:
@@ -118,10 +110,11 @@ jobs:
             // Look for an existing comment from this workflow so we update
             // instead of creating a new one on every push.
             const marker = '### VSIX Build Artifacts';
-            const { data: comments } = await github.rest.issues.listComments({
+            const comments = await github.paginate(github.rest.issues.listComments, {
               owner: context.repo.owner,
               repo: context.repo.repo,
               issue_number: context.issue.number,
+              per_page: 100,
             });
 
             const existing = comments.find(