Remove obsolete Ruff A004 suppression from lint config

[Copilot]

This issue requested fixing A004 and removing its suppression from pyproject.toml. The codebase no longer needs the suppression, so the config is now aligned with actual lint state.

• Lint configuration cleanup

  • Removed A004 (import shadows built-in) from the global Ruff ignore list in pyproject.toml.
  • No source code changes were required because there are no active A004 violations.

• Resulting config diff

  [tool.ruff.lint]
  ignore = [
    "A001",     # Variable shadows built-in
    "A002",     # Argument shadows built-in
    # "A004",   # Import shadows built-in  <-- removed
    "FBT001",
    ...
  ]

[Copilot]

Pull request overview

This PR cleans up the repository’s Ruff lint configuration by removing an obsolete global suppression for A004 (“import shadows built-in”) from pyproject.toml, aligning the config with the current lint state.

Changes:

• Removed A004 from [tool.ruff.lint].ignore in pyproject.toml.

Show a summary per file

File	Description
pyproject.toml	Removes the now-unneeded A004 ignore entry from the Ruff lint ignore list.

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