Add Cursor Cloud specific instructions to AGENTS.md

[kkraus14]

Description

Set up the Cursor Cloud Agent development environment for the cuda-python monorepo.

Changes

1. AGENTS.md: Add ## Cursor Cloud specific instructions section documenting:

   • pixi as the primary environment manager (pulls CUDA headers from conda-forge)
   • Build commands for all three packages (cuda_pathfinder, cuda_bindings, cuda_core)
   • cu13 environment requirement for bindings/core (default env doesn't pin CUDA version)
   • Runtime vs build limitations (builds work without GPU; imports/tests for cuda_core need GPU)
   • Gotchas: lockfile v6 warnings, pre-commit first-run latency, default env build failures

2. Cherry-pick from PR cuda.core: fix invalid python_version target in pixi.toml #2029: Fix invalid python_version target in cuda_core/pixi.toml

   • [package.target.'python_version < "3.11"'] is not valid pixi syntax
   • Moved backports.strenum to unconditional [package.run-dependencies]

Verified

Package	Build	Import	Tests
cuda_pathfinder	pixi install -e default	from cuda.pathfinder import load_nvidia_dynamic_lib	975 passed, 4 skipped
cuda_bindings	pixi install -e cu13 (26 .so modules)	from cuda.bindings import driver, runtime, nvrtc	Requires GPU
cuda_core	pixi install -e cu13 (38 .so modules)	Runtime import needs GPU drivers	Requires GPU
Lint (ruff)	pixi run ruff check .	All checks passed	N/A
pre-commit	pre-commit run --all-files	21/21 hooks passed	N/A

Checklist

• New or existing tests cover these changes.
• The documentation is up to date with these changes.

  

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