[khuxaiphi-stack]

Summary

Implements three open Dozer bounties:

1. Streaming SQL IN / NOT IN Operator (#1659 — $600):
   • dozer-sql/src/pipeline/expression/in_clause_operator.rs: Implements Expression::InList with a precomputed HashSet<Field> fast path for constant literal lists ($O(1)$ lookup) and dynamic fallback with SQL three-valued NULL semantics (TRUE / FALSE / NULL).
2. WASM User-Defined Functions (#1653 — $600):
   • dozer-sql/src/pipeline/expression/wasm_udf.rs: Implements WasmUdfScalarFunction using wasmtime linear-memory ABI (dozer_alloc, dozer_dealloc) with JSON-encoded Vec<Field> arguments and fuel-metered execution.
3. Dozer + LLM + Vector DB + LangChain Sample (#1690 — $250):
   • dozer-sql/src/pipeline/expression/dozer-banking-rag.ts: Real-time gRPC CDC consumer (OnEvent) indexing live PostgreSQL transactions into Qdrant for LangChain RAG queries.

Closes #1659
Closes #1653
Closes #1690
/claim #1659
/claim #1653
/claim #1690

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