libmetal release V2026.04.0 - v1.10.0

This release:

• adds support for machine-specific interfaces outside of libmetal
• updates NuttX mutex support to handle recursive mutexes
• fixes propagation of the PROJECT_EC_FLAGS build option to the parent project
• adds cross-platform tests
• fixes miscellaneous documentation and CI issues

API Updates:

None

Deprecation:

None

What's Changed

• Add cross-platform tests for libmetal by @lntaf in #335
• CI: Update to Zephyr 4.3 and use default associated sdk by @arnopo in #351
• lib: Fix file headers for doxygen generation by @arnopo in #353
• mutex: change the libmetal nuttx mutex to recursive mutex by @CV-Bowen in #352
• CI: Update QEMU Xtensa board name by @arnopo in #355
• Build machine-less libmetal by @tnmysh in #350
• Remove toc not included and other sphinx warnings by @sipke in #358
• cmake: Do not propagate compilation options to the main project by @arnopo in #357
• lib: Fix docs group names by @glneo in #359
• release: libmetal 2026.04.0 by @arnopo in #363

New Contributors

• @lntaf made their first contribution in #335

Full Changelog: v2025.10.0...v2026.04.0