Document Python 3.15 support in AGENTS guides

Update the CI Python version lists and note that 3.15 is GIL-only for now
(conda-forge ships cp315 but not cp315t), with conda jobs pinning the ABI.

Author: antonwolfy

.github/AGENTS.md

@@ -3,7 +3,7 @@
 CI/CD workflows, automation, security scanning, and package distribution.
 
 ## Workflows
-All build/test workflows cover Python 3.10-3.14 plus free-threaded 3.14t.
+All build/test workflows cover Python 3.10-3.15 plus free-threaded 3.14t.
 
 - **conda-package.yml** — main build/test pipeline (Linux/Windows)
 - **conda-package-cf.yml** — build/test using only conda-forge channel (Linux/Windows)
@@ -17,8 +17,9 @@ All build/test workflows cover Python 3.10-3.14 plus free-threaded 3.14t.
 - Keep build matrix (Python versions, platforms) in workflow files only
 - Required checks: conda build + test on supported Python versions/platforms in CI
 - Python 3.14 is expressed as two `include` rows carrying `python_spec` (`3.14.* *_cp314` and `3.14.* *_cp314t`); a bare `--python 3.14` has been observed to select the free-threaded ABI and must not be relied on
+- Python 3.15 is GIL-only for now (conda-forge's `python315` migration ships `*_cp315` but not `*_cp315t`); conda jobs pin the ABI explicitly with `python_spec: '3.15.* *_cp315'` to stay robust if a free-threaded `3.15t` build appears later
 - `include` rows create new matrix combinations and inherit nothing, so `experimental` must be repeated wherever the job reads them
-- Artifact naming: `$PACKAGE_NAME $OS Python $VERSION`, where `$VERSION` is `python_tag` (`3.14` or `3.14t`) when set, otherwise `python`
+- Artifact naming: `$PACKAGE_NAME $OS Python $VERSION`, where `$VERSION` is `python_tag` (`3.14`, `3.14t`, or `3.15`) when set, otherwise `python`
 - Channels: `conda-forge`, Intel channel
 
 ## Security

AGENTS.md

@@ -46,8 +46,9 @@ python -m pip install --no-deps --no-build-isolation .
 
 ## CI/CD
 - **Platforms in CI workflows:** Linux, Windows, macOS (conda-forge workflow only)
-- **Python versions:** 3.10, 3.11, 3.12, 3.13, 3.14, and free-threaded 3.14t
+- **Python versions:** 3.10, 3.11, 3.12, 3.13, 3.14, 3.15, and free-threaded 3.14t
 - **Python 3.14 ABI selection:** conda jobs must request an explicit ABI, `3.14.* *_cp314` (GIL) or `3.14.* *_cp314t` (free-threaded). Once the recipes stopped constraining `python-gil`, a bare `--python 3.14` was observed to resolve to the free-threaded build, so it must not be relied on.
+- **Python 3.15:** GIL-only for now; conda-forge's `python315` migration provides `*_cp315` but no free-threaded `*_cp315t` yet. Conda jobs pin `3.15.* *_cp315` explicitly for the same ABI-selection reason as 3.14.
 - **Workflows:** `.github/workflows/`
   - `conda-package.yml` — main conda build/test pipeline
   - `conda-package-cf.yml` — conda build/test using only conda-forge channel

conda-recipe/AGENTS.md

@@ -10,7 +10,7 @@ Conda package build recipe for conda-forge and Intel channel distribution.
 
 ## Build configuration
 - **Channels:** `conda-forge`, Intel channel
-- **Python versions in CI build matrix:** 3.10, 3.11, 3.12, 3.13, 3.14, and free-threaded 3.14t
+- **Python versions in CI build matrix:** 3.10, 3.11, 3.12, 3.13, 3.14, 3.15, and free-threaded 3.14t
 - **Compilers:** pinned via `conda_build_config.yaml` (GCC/GXX on Linux, VS2022 on Windows)
 - **Dependencies:** `mkl` (runtime), `mkl-devel` (build), `cython >=3.1.0`