Improve handling of embedded resource $defs names

[jviotti]

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

[augmentcode]

🤖 Augment PR Summary

Summary: This PR improves how symbol/name segments are derived from embedded resource identifiers in $defs, especially when those identifiers are URIs that include file extensions.

Changes:

• Added a helper to strip all filename extensions (e.g., email.schema.json → email) when deriving symbol segments.
• Adjusted URI token parsing so the last path segment has its extensions removed.
• Special-cased file:// URIs to use only the filename (without extensions) when generating symbol segments.
• Updated the bundled-schema TypeScript e2e fixture to use .json / multi-extension URIs in $ref, $id, and $defs keys.
• Added a new TypeScript e2e fixture covering bundled schemas that use file:// URIs.

Technical Notes: The updated logic preserves existing path-segment behavior for non-file absolute URIs while improving stability/readability of generated identifiers when schemas are named with common JSON Schema filename conventions.

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[augmentcode]

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