fix: retry pending repository-native checks

[kazukinakai]

Summary

• capture the evaluator pending status under GitHub Actions implicit errexit
• retry only status 75 until the existing fail-closed timeout
• keep non-pending evaluator failures immediate
• pin caller and implementation to the reviewed fix commit

Production evidence

The agiletec canary reached both successful native checks, but repository-gates exited on the first pending status before the retry branch could run.

Verification

• python3 -m unittest discover -s tests (35 passed)
• shell and Node syntax checks
• actionlint v1.7.7
• git diff --check