Disable implicit optional for mypy

[markkuhn]

Description of changes:
mypy's default config for no_implicit_optional is True which causes mypy to treat arguments with a None default value as having an implicit [Optional]. This was causing our recent builds to fail.

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[hussam789]

PR Code Suggestions ✨

Category	Suggestion	Impact
General	Enable stricter type checking Setting no_implicit_optional to True would be more consistent with the strict typing approach shown in the rest of the configuration. When False, it allows None as a valid value for arguments without an explicit Optional annotation, which can lead to unexpected runtime errors. mypy.ini [17] -no_implicit_optional = False +no_implicit_optional = True Apply this suggestion Suggestion importance[1-10]: 5 __ Why: The suggestion changes no_implicit_optional from False to True to enforce stricter type checking, which is a moderate configuration change that may improve consistency; however, it's a preference adjustment rather than a critical bug fix.	Low
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