[I] [geaflow/ai-memory] Add `Extraction SPI` with deterministic fake extractor [geaflow]

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

kitalkuyo-gita opened a new issue, #837:
URL: https://github.com/apache/geaflow/issues/837

   Priority: P0  
   Difficulty: Intermediate
   
   Context: Phase 1 needs a replaceable extraction layer. Contributors should be able to test the workflow without online LLM credentials.
   
   Scope:
   
   - Add `Extractor` interface.
   - Add `ExtractionRequest`, `ExtractionResult`, `ExtractedVertex`, `ExtractedEdge`, `ExtractedTriple`.
   - Add deterministic fake extractor driven by fixtures.
   
   Constraints:
   
   - Do not integrate remote LLM calls yet.
   - Do not write directly to `MemoryGraph`.
   - The extractor must preserve original chunk IDs and source spans.
   
   Acceptance Criteria:
   
   - Fake extractor converts fixture chunks into typed graph facts.
   - Error, empty, and partial extraction cases are covered.
   - Results include schema version, extractor version, confidence, and provenance.
   
   Suggested paths:
   
   - `geaflow-ai/src/main/java/org/apache/geaflow/ai/extract`
   - `geaflow-ai/src/test/resources/extraction/results`


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