Deployments not triggering since 25 Aug (GitHub App integration) -- project tredis-prototype

Project: tredis-prototype, team: thetredisheritagehospitality-8146s-projects (Hobby plan).

Deployments stopped triggering after 25 August. Last successful deployment was commit aad78a8. Every commit pushed since then -- including a deliberate empty test commit, and two more pushed today (631e6fd, a5a20c7) -- has not triggered a new build. The Overview/Deployments page simply shows no new activity for these commits.

What I've already checked:

Repo is connected via the GitHub App integration (not a classic webhook), and the App shows as installed with repo access.
Build and Deployment settings: 'Skip deployments when there are no changes to the root directory or its dependencies' is OFF.
No shadow/duplicate Vercel project pointing at the same repo.
Vercel account login/connections all look correct.
No Ignored Build Step script configured (Behavior: Automatic).

I tried the AI support chat earlier, but on the Hobby plan every CI/CD problem area (CLI, Builds, Git Providers) routes to 'visit the community' instead of creating a real support case -- so I'm posting here directly.

Has anyone else seen GitHub App-triggered deployments silently stop, with no error and no build queued at all? Would appreciate any pointers on what else to check, thanks.

Update: this is bigger than a GitHub trigger issue. I created a Deploy Hook for main (bypasses GitHub entirely) and triggered it via a plain GET request. The API accepted it and returned a job: {"job":{"id":"IC16eOMd3SbCJcRj4ZyY","state":"PENDING","createdAt":1788257683138}}. Over a minute later, no new deployment ever appeared in the Deployments list -- it never left PENDING or showed up anywhere. Since a Deploy Hook is Vercel's own internal API and doesn't touch GitHub at all, this rules out the GitHub App/webhook as the cause. Something in the build/deploy queue for this project (prj_uBPbBA45qDtmn7S6AwZymcRinmWG, team thetredisheritagehospitality-8146s-projects) appears to be stuck or not processing jobs at all. Would appreciate someone from Vercel looking at this project's queue directly.

Project: tredis-prototype, team: thetredisheritagehospitality-8146s-projects (Hobby plan).

What I've already checked:

Repo is connected via the GitHub App integration (not a classic webhook), and the App shows as installed with repo access.
Build and Deployment settings: 'Skip deployments when there are no changes to the root directory or its dependencies' is OFF.
No shadow/duplicate Vercel project pointing at the same repo.
Vercel account login/connections all look correct.
No Ignored Build Step script configured (Behavior: Automatic).

Has anyone else seen GitHub App-triggered deployments silently stop, with no error and no build queued at all? Would appreciate any pointers on what else to check, thanks.