Include license file in built distributions

[julia-thorn]

Description

Add explicit license_files to Python package build metadata so wheels/sdists expose standard License-File entries.

Motivation and Context

Downstream compliance tooling may fail to discover license text when only SPDX/classifier metadata is present and License-File fields are missing, even if license files are included in the wheel.

[Copilot]

Pull request overview

Adds explicit license_files to the Python package build metadata so wheel/sdist metadata includes License-File entries for compliance tooling.

Changes:

• Declare license_files in setup.py to emit License-File metadata entries.
• Include both the main license text and third-party notices in the declared license file set.

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[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated 3 comments.

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[julia-thorn]

@copilot open a new pull request to apply changes based on the comments in this thread

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.

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