Upgrade Core to 6866e0e65979ced65cb5d37bde8cffd26eae9b86

[jviotti]

Signed-off-by: Juan Cruz Viotti [email protected]

[augmentcode]

🤖 Augment PR Summary

Summary: Updates the vendored sourcemeta/core dependency to a newer upstream commit and aligns the local vendored sources with upstream behavior.

Changes:

• Bumped core in DEPENDENCIES to 6866e0e65979ced65cb5d37bde8cffd26eae9b86.
• Refactored JSON Schema framing utilities in vendor/core/src/core/jsonschema/frame.cc to be container-agnostic (now templated over map type).
• Introduced a combined walk (CombinedWalkResult / find_dialect_and_all_bases) to gather nearest dialect + all base URIs in a single traversal.
• Switched internal caches for subschemas/base URIs/dialects from std::unordered_map to std::map.
• Updated the pointer-location framing loop to reuse precomputed “nearest base” information and hoist base view/dialect lookups.

Technical Notes: The framing pass now derives the dialect match and base-URI chain together, reducing repeated ancestor walks and keeping base-depth/dialect metadata consistent across stored locations.

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[augmentcode]

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