The .sha256 files generated during release builds contained only the hash,
but sha256sum -c expects the format "hash filename". This caused all
install.sh updates to fail with "Checksum verification failed" even when
the checksum was correct.
Root cause: build-release.sh line 289 was using awk to extract only field 1
(the hash), discarding the filename that sha256sum -c needs.
Fix: Remove the awk filter to preserve the full sha256sum output format.
This affected the demo server update workflow and user installations.
615cb129df