Add a new primitive `string_indexOf_with_startIndex` that accepts a second integer argument to specify the starting position for the search. Modify the existing `wrenStringFind` function to accept a `startIndex` parameter, updating its Boyer-Moore-Horspool algorithm to begin scanning from the given offset. Update the `string_contains` primitive to pass `0` as the start index. Register the new overloaded method as `indexOf(_,_)` on the string class and add test cases covering boundary conditions and out-of-range start indices.
The previous link pointed to a non-existent ../range.html page. The corrected link now points to the proper anchor #ranges within the values documentation page, ensuring readers can access the friendly introduction as intended.
underscorediscovery