Finish GitHub integration wiring for the realty repo

MCCitiesNetwork/realty is set up on the tesks side (repo link → PAR team · Realty project · PR-open → In Progress · PR-merge → Pending Release · autolink + closes-on-fix), but two GitHub-side steps remain — both need org-admin on the repo (the agent lacked it):

• Add the repo to the tesks-dev GitHub App install. The MCCitiesNetwork installation is "selected repositories" and does not include realty, so GitHub sends no webhooks for it. Fix: github.com → MCCitiesNetwork → Settings → GitHub Apps → tesks-dev → Configure → add realty (or switch to All repositories).
• Add the PAR- autolink. Repo → Settings → Autolink references → New: key prefix PAR-, target https://tesks-ui.dev.paradaux.io/w/paradaux/issues/PAR-<num>, numeric. (Makes PAR-123 in commits/PRs clickable back to tesks.)

After both, a real commit/PR mentioning a PAR-… ref will link, post a context comment, and drive status. (Equivalent gh api -X POST /repos/MCCitiesNetwork/realty/autolinks … also works with an admin token.)