Add support for Python 3.15

[hsorby]

• Fixes Support python 3.15 #1462.

Adds support for Python 3.15 by building wheels against the stable API.

[Copilot]

Copilot review overview

🟡 Changes recommended

Windows wheels omit a required repair step, and Python 3.15 compatibility is not tested.

Review effort: Balanced
Findings: 1 · 1 · 2

Open (4)

• Disabling Windows wheel repair omits the required cellml.dll · New
• Add CI validation for advertised Python 3.15 support · New
• Update documented CMake minimum version to 3.26 · New
• Remove unused duplicate setup script · New

What changed in this PR

Adds Python 3.15 compatibility by producing CPython 3.10 stable-ABI wheels.

Changes:

• Enables abi3 compilation and wheel tagging.
• Updates Python/CMake discovery for stable-ABI modules.
• Consolidates release builds into per-platform stable-ABI wheels.

File	Description
src/​bindings/​python/​pyproject.toml	Configures CPython 3.10 stable-ABI tagging.
src/​bindings/​python/​CMakeLists.txt	Enables the limited Python API.
src/​bindings/​python/​cibuildwheel.setup.py	Adds duplicate legacy packaging configuration.
CMakeLists.txt	Raises the minimum CMake version.
cmake/​environmentchecks.cmake	Detects and selects stable-ABI linking support.
.github/​workflows/​deploy-on-release.yml	Builds and publishes platform-specific ABI3 wheels.

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[Copilot]

Copilot review overview

🟡 Changes recommended

The SWIG minimum and version-specific Python-link fallback can produce wheels that fail under Python 3.15.

Review effort: Balanced
Findings: 2

Open (2)

• Avoid Python::Module fallback in stable-ABI builds · New
• Require SWIG 4.4+ for Python 3.15-compatible wheels · New

Resolved since last review (4)

• Disabling Windows wheel repair omits the required cellml.dll
• Add CI validation for advertised Python 3.15 support
• Remove unused duplicate setup script
• Update documented CMake minimum version to 3.26

[Copilot]

Copilot review overview

🟡 Changes recommended

The SWIG guidance incorrectly suggests older generated bindings can support Python 3.15.

Review effort: Balanced
Findings: 1

Open (1)

• Clarify SWIG 4.4 requirement for Python 3.15+ bindings · New

Resolved since last review (2)

• Require SWIG 4.4+ for Python 3.15-compatible wheels
• Avoid Python::Module fallback in stable-ABI builds

[Copilot]

Copilot review overview

🟡 Changes recommended

Limited-API compilation currently breaks the documented SWIG 3.0.12 build path.

Review effort: Balanced
Findings: 1

Open (1)

• Unconditionally enabling limited API breaks SWIG 3 builds · New

Resolved since last review (1)

• Clarify SWIG 4.4 requirement for Python 3.15+ bindings

[Copilot]

Copilot review overview

🟡 Changes recommended

The fallback can mislabel version-specific binaries as ABI3, and the SWIG and Python compatibility changes are inconsistent with documented support.

Review effort: Balanced
Findings: 1 · 1

Open (2)

• Unconditionally enabling limited API breaks SWIG 3 builds
• SWIG 3.x is rejected despite documented local-build support · New

Previously missed (1)

In code that hasn't changed since last review

cp310 ABI floor unexpectedly drops Python 3.9 wheel support

src/​bindings/​python/​pyproject.toml:37

Using cp310 as the ABI floor removes Python 3.9 wheel support, although the previous release matrix explicitly produced 3.9 wheels on supported platforms. The PR is described only as adding Python 3.15 support, so this is an unannounced compatibility break. Either retain 3.9 with a matching limited-API floor if the generated bindings permit it, or explicitly document the dropped Python version as part of this change.

[Copilot]

Copilot review overview

🔵 Needs a closer look

Wheel builds can still receive an abi3 tag when stable-ABI development support was not found.

Review effort: Balanced
Findings: 1 · 1

Open (2)

• Unconditionally enabling limited API breaks SWIG 3 builds
• SWIG 3.x is rejected despite documented local-build support

[Copilot]

Copilot review overview

🔵 Needs a closer look

The WebAssembly documentation still advertises an unsupported CMake minimum.

Review effort: Balanced
Findings: None

Resolved since last review (2)

• Unconditionally enabling limited API breaks SWIG 3 builds
• SWIG 3.x is rejected despite documented local-build support