Normalize imports to Black/isort, add .isort.cfg, and silence E402 in markov_comparison

[dfeen87]

Motivation

• Ensure a consistent import ordering and formatting that satisfies both black and isort so style checks are stable.
• Preserve existing runtime behavior and exported symbols while normalizing multi-line imports to Black-style grouping.
• Silence the spurious flake8 E402 warning for a split theory.dynamics import in simulations/markov_comparison.py without changing import semantics.

Description

• Add a project-level .isort.cfg with profile = black and line_length = 88 to align isort with Black conventions.
• Reformat import blocks in experiments/__init__.py, experiments/leggett_garg/__init__.py, experiments/process_tensor/__init__.py, experiments/reset_tests/__init__.py, simulations/__init__.py, and theory/__init__.py to use Black-friendly multi-line grouping while preserving __all__ and exported symbols.
• Update simulations/markov_comparison.py to split the theory.dynamics imports and attach # noqa: E402 to each line to suppress the module-level import ordering warning without changing behavior.

Testing

• Ran flake8 theory/ analysis/ simulations/ experiments/ tests/ --count --show-source --statistics and it returned no errors (0).
• Ran black --check theory/ analysis/ simulations/ experiments/ tests/ and the files passed Black checks.
• Ran isort --check-only --diff theory/ analysis/ simulations/ experiments/ tests/ and isort reported no ordering violations.

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