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

[kkraus14]

What

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

• add the canonical root LICENSE and synchronize the cuda-bindings, cuda-python, and cuda-core distribution copies
• set Apache-2.0 package metadata and include the license in the affected distributions
• convert maintained, generated, legacy, example, test, documentation, cuda-core, and shared tooling headers to Apache-2.0
• remove legacy EULA blocks and enable cuda-bindings contributions through DCO sign-off
• remove the 12.9.x cuda-core/tooling SPDX exceptions so all non-QA source uses Apache-2.0
• add cuda-core's NOTICE to its source distribution and update cuda-pathfinder's Apache license copyright notice

Generator

The generated licensing changes follow merged cybind MR leof/cybind!453. This manual backport preserves the 12.9.x generated executable bodies and legacy layout; generated changes are limited to copyright/license headers, with the intentional EULA removal from param_packer.h.

A stock regeneration with cybind 538a87a980c88b7d4b8f74c6dff882ac68284f4d was evaluated but is not included. Its --ctk-target-version 12.9.0 handling limits driver and NVRTC only; cuFile, nvFatbin, nvJitLink, NVML, and NVVM are generated through 13.3.0. That output does not build against CUDA 12.9 because it references newer cuFile types, enums, and functions absent from the 12.9 headers.

Validation

• all 12.9.x pre-commit hooks passed
• generated diffs were audited against 12.9.x; every changed generated file is header-only
• cuda-python and cuda-bindings wheels and sdists report License-Expression: Apache-2.0 and License-File: LICENSE with exact canonical license bytes
• cuda-core and cuda-pathfinder sdists report License-Expression: Apache-2.0; cuda-core includes both LICENSE and NOTICE
• a clean CUDA 12.9 native bindings build completed successfully
• 265 native bindings tests passed with 30 expected skips; two host-sensitive CUDA conditional-graph and OpenGL assertions failed
• 9 Cython interoperability tests and 27 bindings utility tests passed
• bindings documentation built successfully
• root, cuda_bindings, cuda_python, and cuda_core license files are byte-identical
• no proprietary identifier or EULA text remains outside the intentionally proprietary qa/ tree

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