Apply Black formatting to imports

[dfeen87]

Motivation

• CI was failing due to Black formatting violations for multi-line imports across several package entrypoints and a simulation module, so imports must follow Black's canonical wrapping and trailing-comma conventions.
• The change is strictly stylistic: preserve all exports, symbol order, and existing # noqa comments while removing formatting violations.

Description

• Reformatted multi-line import statements to Black style in experiments/__init__.py, experiments/leggett_garg/__init__.py, experiments/process_tensor/__init__.py, and experiments/reset_tests/__init__.py.
• Reformatted multi-line imports in simulations/__init__.py, simulations/markov_comparison.py, and theory/__init__.py to match Black’s expected one-item-per-line wrapping and trailing commas.
• No functional changes, symbol renames, or export alterations were made and existing # noqa markers were preserved.
• Commit created with message Apply Black formatting to imports containing only formatting fixes.

Testing

• Ran black experiments/leggett_garg/__init__.py experiments/process_tensor/__init__.py experiments/reset_tests/__init__.py experiments/__init__.py simulations/__init__.py theory/__init__.py simulations/markov_comparison.py, which reformatted 7 files.
• Verified with black --check theory/ analysis/ simulations/ experiments/ tests/ which completed with no output indicating the style check passed.

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