// Validate length and digit‑only content if (trimmed.Length != 6) throw new ArgumentException("Input must contain exactly 6 characters.", nameof(input));

: Likely the identifier for the subbing group or a specific project lead.

"Come on," Jace whispered, typing a final string of commands into his custom converter.

The audio, previously a low hum of station noise, shifted into a rhythmic, mechanical pulsing. It sounded like a heart made of vacuum tubes. The "Fixed" Reality