Frank Denis 1872c85ac2 std.crypto.ed25519: support cofactorless verification
Add verifyStrict() functions for cofactorless verification.

Also:

- Support messages < 64 characters in the test vectors
- Allow mulDoubleBasePublic to return the identity as a regular
value. There are valid use cases for this.
2025-09-08 14:25:57 -07:00
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