Restore cut chunk hashes from the snapshot database to 16 characters
for its error messages, so a shorter hash panicked. Those messages now
use shortHash. Under --verify, a file_chunks row with no chunks row was
dereferenced, and the chunk size from the database was allocated in
one piece, so a negative or huge size panicked. A missing row is now an
error, a negative size is rejected, and each chunk is hashed by
streaming it from the restored file.
A restored file shorter than its chunks now fails verify as a short
read instead of an unexpected EOF.
Model: opus-5-5
sneak