feat!: remove python-inject dependency

[hf-kklein]

Summary

• Remove inject from pyproject.toml dependencies and all source/test code
• Make ahb_context: AhbContext a required parameter on all evaluation entry points (evaluate_ahb_expression_tree, requirement_constraint_evaluation, format_constraint_evaluation, ConditionNodeBuilder, etc.)
• Remove EvaluatableDataProvider class, create_and_inject_hardcoded_evaluators function, all @inject.params decorators, and the inject.InjectorException catch in Evaluator.__init__
• Update all 12 test files to use AhbContext directly instead of inject.configure / inject.clear
• Delete test_warning_when_using_inject_attr.py (no longer relevant)
• Update minimal_working_example.ipynb to use only AhbContext-based API
• Net reduction: 393 insertions, 1025 deletions (-632 lines)

This is PR 12 in the AhbContext migration series. All previous PRs added dual-path support (inject fallback + AhbContext). This PR removes the fallback entirely.

BREAKING CHANGE

python-inject is no longer a dependency. All functions that previously used inject now require an explicit AhbContext parameter. See the v1.3.0 release notes for migration instructions.

Functions where ahb_context remains Optional[AhbContext] = None:

• parse_expression_including_unresolved_subexpressions (only needed when resolve_packages=True)
• extract_categorized_keys (only needed when resolve_packages=True)
• expand_packages

Test plan

• All 536 tests pass (pytest unittests/ -q)
• pylint 10/10 (pylint src/ahbicht)
• isort and black pass (--check)
• inject is not importable in the clean venv (removed from deps)
• CI passes on GitHub

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