Fix extensions not applying to defaultDialect relative paths

[jviotti]

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

[cubic-dev-ai]

1 issue found across 8 files

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[augmentcode]

🤖 Augment PR Summary

Summary: This PR fixes how the CLI resolves relative defaultDialect values so that extension handling and the configuration base path behave consistently.

Changes:

• Clarifies in the docs that relative defaultDialect resolution is based on the directory containing jsonschema.json (and is not shifted by the path property).
• Extends resolve_relative_uri to optionally try configured/default schema extensions when a relative path is provided without an extension.
• Updates default_dialect to pass the parsed extensions (from CLI/config) into relative resolution, while leaving absolute URIs untouched.
• Adds new inspect shell tests covering “no base shift”, extension fallbacks for JSON/YAML/custom extensions, and CLI --default-dialect fallback behavior.

Technical Notes: Extension fallback uses the merged extension set from CLI and configuration, defaulting to .json/.yaml/.yml when none is configured.

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