Add CHANGELOG.md with 2025-26 change summary

[Copilot]

No changelog existed for the 2025–26 development period. Adds CHANGELOG.md in Keep a Changelog format covering all merged work.

Entries

[Unreleased] (Feb 2026)

• inspect connector: normalize_report_data now writes a subject-aware problemtype.description.value ("LLM" vs "AI system") based on artifact type — previously only the description field was updated
• PATTERN regex and INSPECT_MODEL_PREFIXES updated to accept both subjects, enabling re-normalization of already-normalized reports

[0.2.1] – 2025-06-24

• Version tag/pyproject.toml alignment fix

[0.2.0] – 2025-06-24

• Inspect AI connector (convert_eval_log, normalize_report_data)
• CI/CD pipeline with lint, type-check, test, and PyPI publish jobs
• Pydantic v2 migration; typing dependency scoped to python_version < "3.5"
• Initial API docs and tutorial notebook

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