Add rag module: Spring AI 2.0 RAG with pgvector, chunking, reranking and a faithfulness check

Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01B38FGKKam5SCGgwgduVAh3
2026-09-21 19:09:05 +00:00
commit 1d4625a1c2
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+# The pipeline as Spring beans (the shipped configuration, fake models)
+
+stage / role                 bean name                    actual class
+DocumentTransformer          chunker                      TokenTextSplitter
+EmbeddingModel               embeddingModel               HashingEmbeddingModel
+VectorStore                  vectorStore                  PgVectorStore
+RetrievalAugmentationAdvisor retrievalAdvisor             RetrievalAugmentationAdvisor
+LlmReranker                  reranker                     LlmReranker
+ChatModel                    chatModel                    FakeChatModel
+ChatClient                   ragChatClient                DefaultChatClient
+FactCheckingEvaluator        factChecker                  FactCheckingEvaluator
+IngestionService             ingestionService             IngestionService
+RagQueryService              ragQueryService              RagQueryService