Build run repository mismatch


`type`	`https://docs.frem.sh/reference/api/errors/build-run-repo-mismatch`
HTTP status	`400` Bad Request

What it means

build_run_id names a run that belongs to a different repository than repo_full_name.

Accepting it would let one repository’s build vouch for another’s artifact.

Attest the artifact under the repository whose run actually produced it.

All fremforge API errors are RFC 9457 problem+json:

{
  "type": "https://docs.frem.sh/reference/api/errors/build-run-repo-mismatch",
  "title": "Bad Request",
  "status": 400,
  "detail": "..."
}

Branch on type, not on title or detail - those are human-readable and may be reworded.