[12.9.x] Relicense CUDA Bindings and CUDA Python under Apache 2.0

[kkraus14]

What

Manual backport of #2293 for the legacy 12.9.x layout.

• add the canonical root LICENSE and synchronize only cuda_bindings/LICENSE and cuda_python/LICENSE
• set Apache-2.0 package metadata and include the license in both distributions
• convert maintained, generated, legacy, example, test, and documentation headers
• remove legacy EULA blocks and enable cuda-bindings contributions through DCO sign-off
• add targeted SPDX and license-copy checks
• leave cuda-core and cuda-pathfinder licensing, NOTICE, metadata, and package files unchanged

Dependency

This draft depends on #2293 and the green internal cybind source-of-truth MR leof/cybind!452, which still requires independent approval.

Validation

• all 12.9.x pre-commit hooks passed
• cuda-python and cuda-bindings wheels and sdists report License-Expression: Apache-2.0 and License-File: LICENSE with exact canonical license bytes
• CUDA 12.9 bindings wheel and sdist built successfully
• 265 native bindings tests passed with 30 expected skips; two host-sensitive CUDA conditional-graph and OpenGL assertions failed
• 9 Cython interoperability tests passed
• bindings documentation built successfully
• no cuda_core or cuda_pathfinder diff is present
• no proprietary identifier or EULA text remains under cuda_bindings or cuda_python

[copy-pr-bot]

Auto-sync is disabled for draft pull requests in this repository. Workflows must be run manually.

Contributors can view more details about this message here.