demo: swap QA_ONLY sample to r_013

demo: BOTH sample -> valid qty change (r_082) to showcase Slack approval (HITL) + RAG

demo: rename QA sample company to fictional (Meridian Trading)

demo: format sample emails (paragraphs + named signatures)

perf: reranker -> bge-reranker-base (hit 88.3% in multi-query, 3x faster than v2-m3; MiniLM too lossy)

demo: faster default samples (QA cited / ACTION blocked-no-stock / BOTH blocked-qty+RAG)

perf: lighter reranker (ms-marco-MiniLM-L-6-v2) via config; bake it in image

fix: router model deepseek-v4-flash -> gpt-4o-mini (speed + deploy reliability)

fix: enforce verbatim identifiers in RAG answer + synthesizer (no truncation)

fix: add langgraph-checkpoint-sqlite (AsyncSqliteSaver) for server startup

deploy: SAP ERP AI Agent (HF Spaces docker)

Update README.md

initial commit