Lexes all 714 .jai files (17.1M chars, 3.0M tokens) and asserts round-trip
tiling, strict offset progress, and zero BAD_CHARACTER. Green on first run.
jaitest: use cleanTest and retry once when a concurrent Gradle run clobbers
build/test-results (java.io.EOFException with no XML).
JaiLexer mirrors compose_new_token in the compiler's own lexer. Nested block
comments and here-strings are each consumed inside a single token, so the lexer
state is always 0 and it can restart at any token boundary.
13 plain-JUnit tests, one per gotcha in the language reference §14.
