Addressed copilot review

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[Copilot]

Pull request overview

This PR refines HED query parsing and reporting, primarily by clarifying how the @tag prefix is handled and by improving readability of query-parse error details returned to callers.

Changes:

• Treat @tag as a prefix handled by Expression.__init__ rather than a standalone token kind in Token.
• Normalize exception whitespace in get_query_handlers so parse errors are returned as single-line, more readable issue strings.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
hed/models/query_util.py	Removes @ from the token mapping and updates the NotInLine comment to reflect prefix handling.
hed/models/query_service.py	Collapses whitespace in exception details when building [BadQuery ...] issue messages.