fix: validate complete output hex and string user IDs - #510
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Reject malformed output keys and masks before hex decoding, including a valid 32-byte prefix followed by an odd nibble or non-hex suffix. Preserve uppercase hex and the default mask behavior.
Require decimal-string user IDs at runtime so JavaScript numbers cannot silently encode an already-rounded ID.
Addresses the two input-validation review findings in #509. Adds regression coverage for invalid inputs and preserved valid behavior.
Validation: 187 tests passed; 16 integration tests skipped. Lint and TypeScript checks passed.