Upgrade Core to 31d3868e3f4217be3ed5de3b0ea31d521f1b873c

[jviotti]

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

[augmentcode]

🤖 Augment PR Summary

Summary: Updates the vendored sourcemeta/core dependency to commit 42bd02b4…, aligning jsonbinpack with the latest Core APIs and schema tooling.

Changes:

• Bump Core revision in DEPENDENCIES and adjust compiler canonicalization to use AlterSchemaMode::Canonicalize.
• Add string whitespace helpers in Core JSON (e.g. JSON::is_trimmed()) and minor hashing/trim refactors.
• Extend JSON Pointer support (stringify PointerTemplate, hashing for pointer templates, convenience constructors).
• Improve JSON Schema framing/instance-location propagation, especially around definitions and reference chains.
• Refactor schema transformer internals (rule storage order, richer apply() return with a health percentage) and update type parsing to accept string-or-array type.
• Enhance YAML/JSON reading behavior by falling back based on parse errors when the extension is unknown.
• Restructure/expand alterschema rules, introducing new canonicalizer/common/linter rules and renaming modes to Linter/Canonicalize.

Technical Notes: This is largely an upstream vendored change; downstream callers should account for the updated alterschema mode names and the updated schema-transformer apply()/check() return types.

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[augmentcode]

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