Platformio

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* Introduced the `PLATFORMIO_RUN_JOBS <https://docs.platformio.org/en/latest/envvars.html#envvar-PLATFORMIO_RUN_JOBS>`__ environment variable, allowing manual override of the number of parallel build jobs (`issue 5077 <https://github.com/platformio/platformio-core/issues/5077>`_)
* Added support for ``tar.xz`` tarball dependencies (`pull 4974 <https://github.com/platformio/platformio-core/pull/4974>`_)
* Ensured that dependencies of private libraries are no longer unnecessarily re-installed, optimizing dependency management and reducing redundant operations (`issue 4987 <https://github.com/platformio/platformio-core/issues/4987>`_)
* Resolved an issue where the ``compiledb`` target failed to properly escape compiler executable paths containing spaces (`issue 4998 <https://github.com/platformio/platformio-core/issues/4998>`_)
* Resolved an issue with incorrect path resolution when linking static libraries via the `build_flags <https://docs.platformio.org/en/latest/projectconf/sections/env/options/build/build_flags.html>`__ option (`issue #5004 <https://github.com/platformio/platformio-core/issues/5004>`_)
* Resolved an issue where the ``--project-dir`` flag did not function correctly with the `pio check <https://docs.platformio.org/en/latest/core/userguide/cmd_check.html>`__ and `pio debug <https://docs.platformio.org/en/latest/core/userguide/cmd_debug.html>`__ commands (`issue #5029 <https://github.com/platformio/platformio-core/issues/5029>`_)
* Resolved an issue where the |LDF| occasionally excluded bundled platform libraries from the dependency graph (`pull 4941 <https://github.com/platformio/platformio-core/pull/4941>`_)

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* Added support for Python 3.13
* Introduced the `PLATFORMIO_SYSTEM_TYPE <https://docs.platformio.org/en/latest/envvars.html#envvar-PLATFORMIO_SYSTEM_TYPE>`__ environment variable, enabling manual override of the detected system type for greater flexibility and control in custom build environments
* Enhanced internet connection checks by falling back to HTTPS protocol when HTTP (port 80) fails (`issue 4980 <https://github.com/platformio/platformio-core/issues/4980>`_)
* Upgraded the build engine to the latest version of SCons (4.8.1) to improve build performance, reliability, and compatibility with other tools and systems (`release notes <https://github.com/SCons/scons/releases/tag/4.8.1>`__)
* Upgraded the `Doctest <https://docs.platformio.org/en/latest/advanced/unit-testing/frameworks/doctest.html>`__ testing framework to version 2.4.11, the `GoogleTest <https://docs.platformio.org/en/latest/advanced/unit-testing/frameworks/doctest.html>`__ to version 1.15.2, and the `Unity <https://docs.platformio.org/en/latest/advanced/unit-testing/frameworks/unity.html>`__ to version 2.6.0, incorporating the latest features and improvements for enhanced testing capabilities
* Corrected an issue where the incorrect public class was imported for the ``DoctestTestRunner`` (`issue 4949 <https://github.com/platformio/platformio-core/issues/4949>`_)

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* Resolved an issue where the |LDF| couldn't locate a library dependency declared via version control system repository (`issue 4885 <https://github.com/platformio/platformio-core/issues/4885>`_)
* Resolved an issue related to the inaccurate detection of the Clang compiler (`pull 4897 <https://github.com/platformio/platformio-core/pull/4897>`_)

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* Introduced the ``--json-output`` option to the `pio test <https://docs.platformio.org/en/latest/core/userguide/cmd_test.html>`__ command, enabling users to generate test results in the JSON format
* Upgraded the build engine to the latest version of SCons (4.7.0) to improve build performance, reliability, and compatibility with other tools and systems (`release notes <https://github.com/SCons/scons/releases/tag/4.7.0>`__)
* Broadened version support for the ``pyelftools`` dependency, enabling compatibility with lower versions and facilitating integration with a wider range of third-party tools (`issue 4834 <https://github.com/platformio/platformio-core/issues/4834>`_)
* Addressed an issue where passing a relative path (``--project-dir``) to the `pio project init <https://docs.platformio.org/en/latest/core/userguide/project/cmd_init.html>`__ command resulted in an error (`issue #4847 <https://github.com/platformio/platformio-core/issues/4847>`_)
* Enhanced |STATICCODEANALYSIS| to accommodate scenarios where custom ``src_dir`` or ``include_dir`` are located outside the project folder (`pull 4874 <https://github.com/platformio/platformio-core/pull/4874>`_)
* Corrected the validation of ``symlink://`` `package specifications <https://docs.platformio.org/en/latest/core/userguide/pkg/cmd_install.html#local-folder>`__ , resolving an issue that caused the package manager to repeatedly reinstall dependencies (`pull 4870 <https://github.com/platformio/platformio-core/pull/4870>`_)
* Resolved an issue related to the relative package path in the `pio pkg publish <https://docs.platformio.org/en/latest/core/userguide/pkg/cmd_publish.html>`__ command
* Resolved an issue where the |LDF| selected an incorrect library version (`issue 4860 <https://github.com/platformio/platformio-core/issues/4860>`_)
* Resolved an issue with the ``hexlify`` filter in the `device monitor <https://docs.platformio.org/en/latest/core/userguide/device/cmd_monitor.html>`__ command, ensuring proper representation of characters with Unicode code points higher than 127 (`issue #4732 <https://github.com/platformio/platformio-core/issues/4732>`_)

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* Expanded support for SCons variables declared in the legacy format ``${SCONS_VARNAME}`` (`issue 4828 <https://github.com/platformio/platformio-core/issues/4828>`_)