fix(fls): follow Java's formats, not Java's errors

Java stays the reference for the .fls format, but its errors are no longer
copied. The Java oracle still measures Java as it is; each deliberate
departure is named in the tests with its reason (JAVA_BUGS) and must really
depart. The corpus - what Java itself writes - still reads exactly as in
Java.

- /dns/hosts: a label may start with a digit, holds no backslash, and the
  last one is not all digits (RFC 1123, RFC 3696); A, MX and NS are read in
  any case (RFC 4343); a negative TTL is invalid, so 3600 (RFC 2181). Also
  for the e-mail server's domain.
- /mailserver/konten.txt: empty fields count (Java's StringTokenizer skips
  them and shifts the rest, so an empty password breaks the account); a
  short line alone is left out, with a warning (Java throws for the whole
  file); a message keeps an empty text or subject (Java's split loses it);
  a ";" in an unescaped subject stays in the message; CRLF lines.
- /konten.txt: the last complete line is the account, also with an empty
  address (Java takes the last line and loses the account); CRLF lines.
- Static DHCP assignments: a broken entry alone is left out (Java loses
  every entry after it).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/fls/src/javaString.ts

@@ -1,5 +1,5 @@
-// java.lang.String and java.util.StringTokenizer as FILIUS's text formats
-// use them — each differs from its JavaScript namesake.
+// java.lang.String as FILIUS's text formats use it - each differs from its
+// JavaScript namesake.
 
 /** `String.trim()`: every UTF-16 unit up to U+0020 off both ends. */
 export function javaTrim(text: string): string {
@@ -17,8 +17,3 @@ export function javaSplit(text: string, separator: string): string[] {
   while (parts.length > 0 && parts[parts.length - 1] === '') parts.pop();
   return parts;
 }
-
-/** `new StringTokenizer(text, separator)`: the non-empty runs between separators. */
-export function javaTokens(text: string, separator: string): string[] {
-  return text.split(separator).filter((token) => token !== '');
-}