fix(ci): pull before push in all-contributors workflow; add @salmanmkc to tinytorch and kits

- Add git pull --rebase before push so concurrent comment-triggered runs
  don't reject each other (only one of three runs had succeeded for PR 1179).
- Manually add @salmanmkc as code contributor to tinytorch and kits
  (labs was already added by the single successful run).

.github/workflows/all-contributors-add.yml

@@ -458,6 +458,8 @@ jobs:
             echo "No changes to commit"
           else
             git commit -m "docs: add @${USERNAME} as ${PROJECT} contributor for ${TYPES}"
+            # Pull before push so concurrent comment-triggered runs don't reject each other
+            git pull --rebase origin ${{ env.TARGET_BRANCH }}
             git push origin ${{ env.TARGET_BRANCH }}
             echo "Changes committed and pushed!"
           fi