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 parser support for +, -, *, / operators with correct precedence (term/factor) and emit method calls. Implement primitive methods for num_plus, num_minus, num_multiply, num_divide, and string_plus. Update VM to pass VM pointer to primitives and add unsupported value for type errors. Include test files for each operator.
