Support URI references in --default-dialect

[jviotti]

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

[augmentcode]

🤖 Augment PR Summary

Summary: This PR extends default-dialect handling to support relative URI/path references, primarily to make --default-dialect and defaultDialect in jsonschema.json usable with local meta-schemas.

Changes:

• Documented that defaultDialect may be an absolute URI or a relative path resolved against the configuration directory, and that --default-dialect resolves relative to the current working directory.
• Introduced resolve_relative_uri to convert relative URI/path inputs into canonical file:// URIs.
• Reused the same relative-resolution helper for configuration resolve map targets.
• Updated default_dialect() to return a resolved string value (instead of a view) to accommodate computed URIs.
• Added a validate test for CLI relative default dialect resolution.
• Added an inspect test verifying that a relative (and path-normalized) defaultDialect in config becomes a canonical file:// URI.

Technical Notes: Relative inputs are normalized via weakly_canonical before being converted to a file:// URI.

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[augmentcode]

Review completed. 2 suggestions posted.

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[cubic-dev-ai]

No issues found across 6 files

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