Minimal hash test: reproduce a known vector

Before relying on a Hash Generator, enter a harmless public test string with an exact encoding and compare its digest with a known reference from an independent implementation. Record the algorithm and whether a trailing newline was included; that single byte changes the result. Then try an empty input and a Unicode example to check the tool's behavior. This tiny sample verifies the data path without exposing sensitive content, though it does not establish security for every use case.