TPZ4008 Host input failure

readStdin reads the remaining standard input bytes through EOF. UTF-8 validity and text preservation follow UTF-8 decoding. It does not append or remove a newline.

No remaining bytes produces an empty string. A later call reads from the stream position left by the earlier call and therefore returns an empty string at EOF. A terminal follows the same EOF rule as redirected input.

The call may wait for input or EOF. Reading consumes input even when the result is later discarded. A host read failure or invalid UTF-8 produces a structured runtime fault at the readStdin call because the function returns a string rather than a Result.

The Topaz 6.0 host input fault is TPZ4008. Its primary location is the readStdin call.