Add strong regression unit tests

[GernotMaier]

No description provided.

[Copilot]

Pull request overview

This PR strengthens the stereo-regression safety net by adding regression-focused contract tests (including CLI wiring) meant to catch unintended behavior changes when shared infrastructure evolves, alongside small supporting fixes in utilities and preprocessing.

Changes:

• Add extensive regression contract/guard test coverage for stereo training, loading, inference, and streaming behavior.
• Harden utility behavior (e.g., ignore directories when discovering *.joblib* artifacts) and adjust regression residual preprocessing to avoid invalid log operations.
• Update development tooling configuration (Ruff + pre-commit hook revisions).

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
tests/test_utils.py	Adds regression-oriented unit tests for utility helpers (joblib discovery, image selection parsing, model parameter loading, memory profiling, joblib loading).
tests/test_regression_shared_contracts.py	Adds shared-infrastructure contract tests to ensure classification-side refactors don’t break regression behavior.
tests/test_regression_production_guard.py	Adds comprehensive “production guard” tests covering regression train/apply/load/streaming internals and invariants.
tests/test_regression_contracts.py	Adds regression boundary/contract tests for persisted feature order, residual inversion, and ROOT output behavior.
tests/scripts/test_stereo_entrypoints.py	Adds console-script wiring tests for stereo train/apply entrypoints.
src/eventdisplay_ml/utils.py	Filters discovered *.joblib* entries to files only; provides memory profiling and joblib-load warning suppression used by new tests.
src/eventdisplay_ml/data_processing.py	Makes MC log-energy computation explicit and avoids logging invalid energies during residual construction.
pyproject.toml	Updates Ruff configuration (notably adds force-exclude and excludes tests/).
.pre-commit-config.yaml	Bumps pre-commit hook revisions (Ruff/isort/codespell).