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Fix JSON schema metadata for dictionary keys - #1159
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Fixes #866.
Dictionary key annotations with JSON Schema metadata are represented internally as Metadata wrappers. The dictionary schema branch only recognized a bare StrType, so adding metadata such as title caused both that metadata and string constraints to disappear from propertyNames.
This change verifies that the wrapped key is a string, generates propertyNames from the original annotated key schema, and removes the redundant string type. Existing behavior for plain and constraint-only string keys is preserved.
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AI assistance disclosure: OpenAI Codex helped investigate, implement, and test this change. The account owner authorized publication; upstream workflows still require maintainer approval before they can run.