chore: Fix 164 ruff linting warnings (149 auto-fixable)

[mikejmorgan-ai]

Description

Running ruff check cortex/ reports 164 linting issues, 149 of which are auto-fixable.

Main Categories

1. Import sorting (I001): Import blocks are un-sorted
2. Deprecated typing (UP035/UP006): Using typing.List, typing.Dict instead of built-in list, dict
3. Optional syntax (UP045): Using Optional[X] instead of X | None

Fix

ruff check cortex/ --fix

Benefits

• Cleaner, more modern Python code
• Better compatibility with Python 3.10+ type hints
• Consistent import ordering