Upgrade Core to 4e9d280a8a452885c7cd2bc488799a4f6410f4d8

[jviotti]

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

[augmentcode]

🤖 Augment PR Summary

Summary: This PR updates the vendored sourcemeta/core dependency to commit 4e9d280a8a… and pulls in the corresponding build/config and library changes.

Changes:

• Bumps DEPENDENCIES to the newer Core revision.
• Adds a new optional Core html component (CMake option + config wiring) and introduces an HTML encoder/escape API plus convenience element helpers.
• Refactors JSON parsing callbacks to avoid constructing temporary JSON values: adds ParseContext, passes array indices / object property names via StringView, and updates the JSON parser and YAML parser accordingly.
• Updates JSON APIs: introduces StringView, adds array contains(StringView), and renames string contains to includes (string/char overloads).
• JSON Pointer changes: removes mangle, adds slice(), and introduces pointer hash/equality helpers for heterogeneous lookups.
• JSON Schema framing improvements: stronger keyword/URI validation errors, better base/dialect walking, pointer-to-location caching, and reachability analysis; SchemaFrame is now non-copyable due to internal caches.
• Schema transformer refactor: rule metadata (mutates/reframe_after_transform), rule exclusion via a schema keyword, and restructuring of the apply/check flow.
• AlterSchema/editorSchema extensions are updated to use the new transformer/framing capabilities and add/remove multiple transformation rules; for_editor now assumes the input schema is already bundled.

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[augmentcode]

Review completed. 2 suggestions posted.

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[augmentcode]

SchemaTransformer::apply() no longer catches SchemaAbortError around rule->transform(...), so a non-fixable rule (default SchemaTransformRule::transform) will now abort the whole apply instead of being reported via the callback/result. This changes the error-handling contract and could turn previously recoverable transform failures into hard failures.

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[augmentcode]

The reachability check only calls frame.traverse(..., LocationType::Subschema) for both reference sources and definition entries; if a referenced schema is framed as a Resource (or otherwise not present as a Subschema location), this may treat a reachable reference as unreachable and incorrectly delete a referenced definition.

Other Locations

• vendor/core/src/extension/alterschema/common/orphan_definitions.h:111

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