Function verifyRawFromBase64

verifyRawFromBase64(
    publicKey: Uint8Array,
    message: Uint8Array,
    sigB64: string,
): boolean
Verifies a Base64-encoded Ed25519 signature.

Convenience wrapper around fromBase64 + verifyRaw.
Parameters
- publicKey: Uint8Array
  32-byte Ed25519 public key.
- message: Uint8Array
  The original message bytes.
- sigB64: string
  Base64-encoded signature.
Returns boolean
true if valid, false otherwise (never throws).
Example
```
if (verifyRawFromBase64(pubKey, data, sigB64)) {
  // authentic
}
```
- Defined in packages/crypto/src/core/signatures.ts:106