Update PolicyEngine Core

Author: anth-volk

CHANGELOG.md

@@ -1,3 +1,14 @@
+## [3.26.1] - 2026-05-07
+
+### Changed
+
+- Added provider-neutral AI engineering guidance for tests, documentation review, pull requests, and changelog fragments.
+
+### Fixed
+
+- Fixed enum encoding for HDF5-style UTF-8 byte-string arrays containing non-ASCII enum member names.
+
+
 ## [3.26.0] - 2026-05-04
 
 ### Added

changelog.d/add-ai-engineering-skills.changed.md

@@ -1,6 +1,6 @@
 [project]
 name = "policyengine-core"
-version = "3.26.0"
+version = "3.26.1"
 description = "Core microsimulation engine enabling country-specific policy models."
 readme = "README.md"
 authors = [