fix(managed-cli): map undecodable staged files to unverified

A staged checksum or VERSION file that is not valid UTF-8 raised
UnicodeDecodeError, which failure_status degraded to the generic error
instead of the unverified tampering signal used for other refused
content. Fold decode failures into the existing checksum_file and
version_file codes.
a5f0987cd5Simone committed on 9/24/2026, 10:41:16 PMparentab12fc8

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