Codecov patch check is not reported after successful coverage uploads

[bcdonadio]

Observed: PR #238 at commit 1981af4773fb692f88eb6131b1b9bff73b336b71 completed two authenticated Codecov coverage uploads successfully (CI run 29879243837, attempts 1 and 2), but Codecov has not created a codecov/patch check run or status. The repository-owned external-admission evaluator remains pending with Waiting for Codecov patch and DCO.

Expected: After a successful coverage upload, Codecov should publish the configured codecov/patch result on the exact PR head so external admission can complete.

Root cause: Unknown. Both upload attempts reported Process Upload complete; GitHub has no codecov/patch check object for the head SHA. The immediately preceding PR #236 received its Codecov patch result about 2.5 minutes after upload, while this PR remained without one after more than 7 minutes and a successful retry.

Repro:

1. Open PR Fix scheduled Codex issue labeler authorization #238 at 1981af4773fb692f88eb6131b1b9bff73b336b71.
2. Run CI workflow 29879243837; observe successful coverage and test-result uploads.
3. Query check runs for the head SHA and observe no codecov/patch result.
4. Observe external admission run 29879245566 remains pending.