Backport #331 to main

[chennes]

No description provided.

To fix an unused import, the general approach is to delete the import statement for the unused module, ensuring no remaining code references it. This removes an unnecessary dependency and slightly improves readability and load time.

In this file, the single best fix is to remove the line import os at line 22, leaving all other imports and code unchanged. This does not affect any existing functionality, as there are no visible uses of os in the snippet. The only required change is to delete that line from AddonManagerTest/app/test_python_deps.py; no new methods, imports, or definitions are needed.

[Copilot]

Pull request overview

This pull request backports changes from PR #331 to the main branch, migrating the entire codebase to SPDX-compliant copyright and license headers. The changes standardize licensing information across all Python files, CMake files, YAML configuration files, and text files.

Changes:

• Updated all file headers from verbose copyright blocks to SPDX-compliant format
• Renamed LICENSE.md to LICENSE with canonical LGPL 2.1 text
• Updated package.xml to reference the new LICENSE file instead of LICENSE.md

Reviewed changes

Copilot reviewed 111 out of 112 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
package.xml	Updated license file reference from LICENSE.md to LICENSE
LICENSE.md (deleted)	Removed markdown-formatted license file
LICENSE (added)	Added canonical LGPL 2.1 license text
All Python files	Converted headers to SPDX format with proper copyright attribution
All CMake files	Added SPDX headers
All YAML workflow files	Added SPDX headers
Configuration files	Added SPDX headers to .gitignore, .pre-commit-config.yaml, ALLOWED_PYTHON_PACKAGES.txt

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[Copilot]

Missing SPDX-FileCopyrightText line. According to the pattern used throughout this PR, files that previously had copyright attribution should have a corresponding SPDX-FileCopyrightText line. The old header showed "Copyright (c) 2022-2023 FreeCAD Project Association", but the new header is missing the SPDX-FileCopyrightText line. It should have:

SPDX-FileCopyrightText: 2022 FreeCAD Project Association

on line 2 (before the SPDX-FileNotice line).

Suggested change

	# SPDX-FileNotice: Part of the AddonManager.
	################################################################################
	# #
	# SPDX-FileCopyrightText: 2022 FreeCAD Project Association
	# SPDX-FileNotice: Part of the AddonManager.
	################################################################################