Support SHA-256 zero OIDs in pre-push hook - #3748
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Fixes #3664.
The pre-push hook previously treated the all-zero object ID as a hard-coded 40-character SHA-1 value. That breaks branch creation/deletion pushes in SHA-256 repositories.
This change adds a hash-format-independent zero-OID check and covers both local and remote zero-OID cases for 40- and 64-character IDs.
Tests: