Add run and event numbers to output tree.

[GernotMaier]

This allows in Eventdisplay to absolutely ensure that events are aligned.

[Copilot]

Pull request overview

Adds run/event identifiers to XGBoost output trees for alignment verification in Eventdisplay.

Changes:

• Writes runNumber and eventNumber to stereo and classification outputs.
• Adds classification provenance tracking and retains size features.
• Updates tests and changelog coverage.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/eventdisplay_ml/models.py	Writes identifiers and changes classification grouping.
src/eventdisplay_ml/data_processing.py	Adds provenance tracking and classification preprocessing changes.
src/eventdisplay_ml/features.py	Retains classification size features.
tests/test_regression_production_guard.py	Tests stereo output identifiers.
tests/test_regression_contracts.py	Updates stereo writer contracts.
tests/test_models_helpers.py	Tests identifier payloads.
tests/test_features.py	Updates size-feature expectations.
tests/test_data_processing_remaining.py	Tests provenance and size retention.
docs/changes/81.feature.md	Documents output identifiers.

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