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

rag/scripts/run-all.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+# Regenerates everything under docs/output/.
+#
+#   scripts/run-all.sh                 uses RAG_PG_URL if set, otherwise starts PostgreSQL with scripts/pg-up.sh
+#   docker compose up -d && RAG_PG_URL=jdbc:postgresql://localhost:5432/ragdb scripts/run-all.sh
+#
+# No API key is needed: the tests use scripted stand-ins for the chat and embedding models.
+set -euo pipefail
+cd "$(dirname "$0")/.."
+
+if [ -z "${RAG_PG_URL:-}" ]; then
+  scripts/pg-up.sh
+  export RAG_PG_URL="jdbc:postgresql://127.0.0.1:${PGPORT:-5439}/ragdb"
+fi
+
+mvn -B -q test            # transcripts 01-11 and 15 (each test writes one and asserts the same numbers)
+scripts/capture-javap.sh          # 12
+scripts/capture-dependencies.sh   # 13
+scripts/capture-legacy-compile.sh # 14
+ls docs/output