Removed the ontology-related code per issue #1177

[VisLab]

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[Copilot]

Pull request overview

This PR removes ontology/OMN generation functionality from this repository, retaining only HED ID utilities and pointing users to the separate hed-ontology repo for ontology-related operations.

Changes:

• Extracted HED ID range, assignment, and validation logic into a new hed_id_util module and updated all call sites and tests to use it.
• Removed ontology-related code and tooling (ontology_util, create_ontology script, CLI entry point, and related tests).
• Updated documentation to remove ontology-generation steps from the release workflow and direct users to the hed-ontology repository.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/schema/test_hed_id_util.py	Redirects tests from ontology_util to the new hed_id_util module and removes tests for now-removed OMN conversion, ensuring HED ID utilities remain covered.
pyproject.toml	Removes the hed_create_ontology console script entry, aligning available CLI commands with the removal of ontology functionality.
hed/scripts/hed_convert_schema.py	Switches to hed_id_util.update_dataframes_from_schema, preserving schema update behavior while decoupling from ontology conversion.
hed/scripts/create_ontology.py	Deletes the ontology-creation script, fully removing ontology generation from this codebase.
hed/schema/schema_io/ontology_util.py	Removes the ontology/OMN conversion utilities now moved to hed-ontology, avoiding dead or duplicated functionality.
hed/schema/schema_io/hed_id_util.py	Introduces a focused utility module for HED ID range computation, validation, and assignment, preserving existing behavior without ontology concerns.
hed/schema/schema_attribute_validator_hed_id.py	Updates the get_library_data import to use hed.schema.hed_cache directly, reflecting the removal of ontology_util.
docs/user_guide.md	Updates schema release best-practices to drop ontology generation steps and adds a note that OMN/OWL generation is now handled in the hed-ontology repository.

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