Working on allowing prerelease schemas to partner with prerelease standard

[VisLab]

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[Copilot]

Pull request overview

Enables loading of prerelease library schemas whose withStandard references a prerelease standard schema, by plumbing an opt-in check_prerelease flag through schema loading APIs and the schema-loading test script.

Changes:

• Add check_prerelease plumbing through load_schema()/from_string() and all schema loader classes so partnered standard lookup can include prerelease cache when enabled.
• Update hed_check_schema_loading/run_loading_check() to pass check_prerelease=True when testing schemas found under prerelease directories, and add early ValueError validation for conflicting flags.
• Expand schema roundtrip validation helper to test both merged and unmerged serialization paths; add a small test for conflicting run_loading_check() flags; document behavior in CHANGELOG.md.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
spec_tests/test_loading_schemas.py	Adds tests ensuring run_loading_check() rejects mutually exclusive flag combinations.
hed/scripts/schema_script_util.py	Refactors schema format roundtrip validation into a helper and runs it for merged/unmerged variants.
hed/scripts/check_schema_loading.py	Passes check_prerelease when loading prerelease schemas and adds programmatic flag-conflict validation.
hed/schema/schema_io/xml2schema.py	Threads check_prerelease into XML loader constructor/superclass.
hed/schema/schema_io/wiki2schema.py	Threads check_prerelease into MediaWiki loader constructor/superclass.
hed/schema/schema_io/json2schema.py	Threads check_prerelease into JSON loader constructor/superclass.
hed/schema/schema_io/df2schema.py	Threads check_prerelease into TSV/dataframe loader and load_spreadsheet.
hed/schema/schema_io/base2schema.py	Stores check_prerelease on the base loader and uses it for withStandard partner resolution.
hed/schema/hed_schema_io.py	Adds check_prerelease parameter to load_schema() and from_string() and forwards to loaders.
CHANGELOG.md	Documents the new prerelease partnering capability and related API/script changes.

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