For similarity checks, handle camel case words

Split words so can use similar checks as if had spaces.

For example, pre-processing will combine separate words into one using camel case, so can be more easily parser by simple grammar.

Then, split camel case into separate words for similarity checks

Long term, can optimize, but initially can use basic logic.

No files, tests, or entry points are named. Locate the preprocessing and similarity-check logic, then trace how camel-case words are currently combined or compared. Done means camel-case words are split into separate words before similarity checks while preserving the existing behavior for other input.

Written by the indexing model from the issue text.