Noir::KotlinSourceMask

Character-preserving masks over Kotlin source text.

Both masks replace every masked-out character with a single space and keep every newline, so the result lines up with the original by character: masked[i] describes source[i], masked.lines[n] is exactly as long as source.lines[n], and a Regex::MatchData#end taken on the masked copy can be used to slice the raw text. Callers depend on that to gate a line scan on the masked copy while reading the real value out of the raw source.

One space per character, not per byte: Crystal's String#[] and MatchData#begin/#end are char-indexed while the scanner walks bytes, so emitting one space per byte made every offset after a non-ASCII comment (a CJK line above a route, an accented author name) drift by the number of continuation bytes and over-trimmed the raw line.