[Maintenance] Move DieLibrary git tag handling to a separate file and expose it to Python

[calladoum-elastic]

Description

• Refactor the handling of the DieLibrary git tag by moving it to a separate file and exposing it to the Python interface.
• Enhance tests to validate the new tag exposure and improve type hints for better clarity.

[Copilot]

Pull request overview

This PR refactors the DieLibrary git tag management by extracting it into a dedicated .dielib_commit file and exposing the tag to the Python interface. The changes improve maintainability by centralizing version control and modernize the codebase with updated type hints using PEP 604 syntax.

Changes:

• Created .dielib_commit file to store the DieLibrary git commit hash
• Exposed dielib_tag to Python via C++ bindings and Python module exports
• Modernized type hints from typing.Union/Optional to PEP 604 union operator (|) syntax
• Enhanced load_database() to accept pathlib.Path in addition to strings
• Added test coverage for the new dielib_tag attribute

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
.dielib_commit	New file containing the DieLibrary git commit hash for version management
cmake/FindDieLibrary.cmake	Updated to read git tag from .dielib_commit file instead of hardcoding it
python/inc/die.hpp	Added DIELIB_TAG preprocessor definition with empty string default
python/CMakeLists.txt	Added compile definition to pass DIE_LIBRARY_GIT_TAG as DIELIB_TAG to C++
python/src/die.cpp	Exposed DIELIB_TAG as module attribute dielib_tag
python/die/__init__.py	Imported and exported dielib_tag; updated type hints to PEP 604 syntax; enhanced load_database to accept Path objects
python/tests/test_die.py	Added assertions for dielib_tag; added redundant null checks; updated string quotes to double quotes

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[calladoum-elastic]

Note: sticking to 09df9ccafe48a0531987ad1e605402ed79d4c3f6 for DieLibrary as more recent builds are (partially) broken