The documentation for the bitwise or operator incorrectly stated that each bit
is true only where corresponding bits of both inputs were true, which describes
the bitwise and operator. Updated to correctly state that each bit is true where
corresponding bits of one or both inputs were true.
Change the C implementation of `num_smallest` primitive to return `DBL_MIN` instead of `DBL_EPSILON`, correcting the value from the machine epsilon (difference between 1.0 and next representable value) to the smallest positive representable double. Update the documentation in `num.markdown` to describe `Num.smallest` as "the smallest positive representable numeric value" and `Num.largest` as "the largest representable numeric value". Add test files `largest.wren` and `smallest.wren` verifying the expected output values.
Restructure the documentation hierarchy to prepare for documenting additional built-in modules. Move all core library documentation from `doc/site/core/` to `doc/site/modules/core/`, rename `modules.markdown` to `modularity.markdown`, remove `^category` metadata lines from all affected pages, update cross-reference links to use relative paths under the new structure, and add a TODO placeholder to the Class class page.