Enforce array schema

[skrabe]

• Fixed a bug where a single object incorrectly passed validation against a schema requiring an array. Updated JSONValidation in validation.ts to treat root-level errors as document-wide issues.
• Fixed a regression where invalid YAML produced validation errors after the root-level error change. Added a check in doValidation to skip validation for unparseable input.
• Added a test in json-validation.spec.ts to verify that a schema expecting an array correctly rejects a single object, boolean, string and number.

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