0.15.6 release

[jeongyoonlee]

Proposed changes

v0.15.6 release

Types of changes

What types of changes does your code introduce to CausalML?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• I have read the CONTRIBUTING doc
• I have signed the CLA
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in downstream modules

Further comments

N/A

[Copilot]

Pull request overview

This PR updates the package version from "0.15.6dev" to "0.15.6" in preparation for the official 0.15.6 release. This release primarily focuses on adding support for scipy>=1.16.0, numpy>=1.25.2, statsmodels>=0.14.5, and Python>=3.11, addressing Cython binary interface compatibility issues with updated dependencies.

Changes:

• Version bump from development version to stable release version

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

The version has been updated from "0.15.6dev" to "0.15.6" for the release, but the changelog at docs/changelog.rst has not been updated with release notes for version 0.15.6. According to the plan document at docs/plans/2026-01-30-scipy-1.16-support.md line 299, the changelog should be updated when releasing. Consider adding an entry for version 0.15.6 describing the main changes (scipy 1.16+ support, updated dependencies, Python 3.11+ requirement, etc.) following the format used for previous releases like 0.15.1 and 0.15.0.

[paullo0106]

🚢