* scoring_algorithm: Moves doctest into function docstring so it will be run
* [mypy] annotates other/scoring_algorithm
* [mypy] renames temp var to unique value to work around mypy issue in other/scoring_algorithm
reusing loop variables with the same name and different types gives
this very confusing mypy error response.
pyright correctly infers the types without issue.
```
scoring_algorithm.py:58: error: Incompatible types in assignment
(expression has type "float", variable has type "List[float]")
scoring_algorithm.py:60: error: Unsupported operand types for -
("List[float]" and "float")
scoring_algorithm.py:65: error: Incompatible types in assignment
(expression has type "float", variable has type "List[float]")
scoring_algorithm.py:67: error: Unsupported operand types for -
("List[float]" and "float")
Found 4 errors in 1 file (checked 1 source file)
```
* scoring_algorithm: uses enumeration instead of manual indexing on loop var
* scoring_algorithm: sometimes we look before we leap.
* clean-up: runs `black` to fix formatting
