Revise metaschemas

[jviotti]

Signed-off-by: Juan Cruz Viotti jv@jviotti.com

[augmentcode]

🤖 Augment PR Summary

Summary: This PR revises the project metaschemas by moving and consolidating validation rules between meta/schemas-root.json and meta/schemas.json.

Changes:

• Relocated the $comment “not a URI reference” constraint from the root metaschema into the general metaschema and combined it with the existing single-line text constraint.
• Moved the x-symbol property definition from the root metaschema into the general metaschema so it’s validated consistently.

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[augmentcode]

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