Add support for floating-point number literals in the parser by detecting decimal points with trailing digits in `readNumber()`, and switch the compiler's `number()` function from `strtol` to `strtod` for proper double conversion. Update the `num_abs` primitive to use `fabs()` instead of manual negation. Extend test coverage across arithmetic, comparison, equality, modulus, and string conversion tests with floating-point cases, and add a new test for decimal point at end-of-file error detection.
Add num_mod primitive using fmod from math.h to support the % operator on number types. Register the new primitive in the numClass method table. Include a comprehensive test file covering positive, negative, and left-associative modulo cases, plus a divide-by-zero TODO comment in the existing division test.
