Use yaml.safe_load/safe_dump for meta YAML

[Vrittigyl]

Summary

Replaced yaml.load / yaml.dump with yaml.safe_load / yaml.safe_dump in meta YAML handling.

Reason

• Prevents arbitrary object construction and avoids Python-specific YAML tags.
• Meta files only require standard Python types, so safe_* functions are sufficient and more secure.

Verification

• pytest passes locally

Closes #94

[gitnotebooks]

Found 1 changed notebook. Review the changes at https://app.gitnotebooks.com/sensorium-competition/experanto/pull/99

[Copilot]

Pull request overview

This PR updates the project’s meta-YAML read/write paths to use PyYAML’s safe_load / safe_dump, aligning with Issue #94’s security and portability goals (avoid arbitrary object construction and Python-specific YAML tags).

Changes:

• Replaced yaml.dump with yaml.safe_dump in test data generators that write meta.yml files.
• Replaced yaml.load(..., Loader=yaml.SafeLoader) with yaml.safe_load in Interpolator meta loading/dispatch logic.
• Updated the sensorium interpolator demo notebook to use yaml.safe_dump when writing a meta file.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/create_time_intervals_data.py	Writes meta.yml via yaml.safe_dump for time-interval test fixtures.
tests/create_sequence_data.py	Writes meta.yml via yaml.safe_dump for sequence test fixtures.
tests/create_screen_data.py	Writes per-frame and root *.yml meta files via yaml.safe_dump.
experanto/interpolators.py	Uses yaml.safe_load for meta.yml reads (both load_meta and Interpolator.create).
examples/sensorium/interpolator_demo.ipynb	Writes meta YAML using yaml.safe_dump in the demo.

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[pollytur]

LGTM