- Fetch every page of pull request files so watch paths match PRs with more than 30 files.
- Deploy the preview and log a warning when the changed-file list is unknown (API error or truncated compare list).
- Log when watch paths decline a preview deployment.
- Keep the GitHub App installation token in memory per instance, so a deployment requests one token instead of 3-5.
Closes#12169
Catch and report failures while updating closed pull request status so preview deployment cleanup still runs for closed GitHub pull request webhooks.
Add coverage for cleanup continuing when GitHub comment cleanup fails.