[I] [geaflow/ai-memory] Implement `SchemaValidator` for extracted graph facts [geaflow]

["kitalkuyo-gita (via GitHub)" <gi...@apache.org>]

kitalkuyo-gita opened a new issue, #840:
URL: https://github.com/apache/geaflow/issues/840

   Priority: P0  
   Difficulty: Intermediate
   
   Context: `GraphEntity` can be written today, but extracted facts need schema validation before entering graph storage or indexes.
   
   Scope:
   
   - Validate vertex labels, edge labels, required properties, property types, and relation endpoints.
   - Return structured validation errors with fact ID and source span.
   - Add tests for invalid label, missing property, wrong type, dangling edge, and unsupported predicate.
   
   Constraints:
   
   - Do not mutate the graph.
   - Do not silently drop invalid facts.
   
   Acceptance Criteria:
   
   - Valid facts pass unchanged.
   - Invalid facts are returned with stable error codes.
   - Error messages do not include full raw document text.
   
   Suggested paths:
   
   - `geaflow-ai/src/main/java/org/apache/geaflow/ai/validate`
   


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