Upgrade Core to 376f397db98e72be48d8401e2fbf2ee96f033966

[jviotti]

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

[augmentcode]

🤖 Augment PR Summary

Summary: Updates the vendored sourcemeta/core dependency to 376f397db98e72be48d8401e2fbf2ee96f033966.
Why: Pulls in upstream pointer/lifecycle fixes and WeakPointer-oriented APIs used by schema tooling.
Changes:

• Adds non-const jsonpointer::get(JSON&, WeakPointer) to allow in-place mutation via weak pointers.
• Migrates SchemaFrame and related callbacks/maps from Pointer to WeakPointer to reduce allocations/copies.
• Updates schema bundling/transformer/editor utilities to convert to strong pointers only when needed (e.g., errors, deferred edits).
• Adjusts formatting to defer object reordering until after frame teardown to avoid invalidating frame views.
• Adds SchemaFrame::has_references_through(..., tail) to check references through a specific keyword token.
• Refactors multiple AlterSchema rules to use static keyword strings and new tail-token reference checks.

Notes: This is primarily an upstream sync; most diffs are mechanical API updates around pointer types and reference tracking.

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[augmentcode]

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