actionchain: ingest failure: trufflehog (upstream broken)

[octo-sts]

All 6 CI failures are caused by a transient GitHub infrastructure issue: the GitHub servers returned HTTP 500 ("Internal Server Error") during the git fetch step of the checkout action, before any test code could execute. Every single failure shows the same pattern: "remote: Internal Server Error" / "fatal: unable to access 'https://github.com/dlorenc/actionchain/': The requested URL returned error: 500". The CI retried 3 times each and all attempts failed with 500. This is not a code issue - it's a GitHub server outage that prevented the repository from being cloned.