Fix bundling not de-duplicating equal schemas

[jviotti]

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

[cubic-dev-ai]

No issues found across 7 files

[augmentcode]

🤖 Augment PR Summary

Summary: This PR fixes schema bundling so that identical schemas (especially embedded resources) are properly de-duplicated instead of being treated as conflicting duplicates.

Changes:

• Fixes resource registration in CustomResolver::add to compare against the normalized subschema (not the original root schema) when detecting duplicate identifiers.
• Updates bundling logic in vendored core to determine the container keyword ($defs vs definitions) via the schema base dialect.
• Adds elevate_embedded_resources to lift embedded, absolute-ID resources from a resolved schema’s definitions into the bundle root and remove duplicates.
• Tracks resolved schema dialects alongside deferred remote schemas to drive correct extraction behavior.
• Adjusts an existing bundle test expectation to reflect the new “lifted” embedded resource layout.
• Adds a new test covering de-duplication of equal embedded resources when resolving multiple schemas.
• Updates the pinned sourcemeta/core dependency revision to include the bundling fix.

Technical Notes: The new behavior relies on resource identifiers (absolute URIs via $id) as the key for de-duplication and conflict detection when consolidating embedded resources into the bundle’s definitions container.

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[augmentcode]

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