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## Summary - Add knowledge-base retrieval support to Go chat completions. ## What changed - Routes KB-backed chat sessions through the Go retrieval service instead of falling back to solo chat. - Resolves embedding and rerank models, validates accessible knowledge bases, and preserves tenant-aware retrieval. - Rejects mixed embedding models across selected knowledge bases before retrieval to avoid incompatible vector dimensions. - Threads the HTTP request context into streaming retrieval so cancelled requests can stop downstream retrieval work. - Applies metadata filters and message-level `doc_ids` before retrieval. - Expands parent/child chunks before building references and prompt context. - Injects retrieved knowledge through a copied dialog prompt config so the caller's original dialog is not mutated. - Honors configured empty responses when no chunks are found. - Names the metadata no-match sentinel and reuses it across retrieval/handler paths. - Adds a defensive content cast while appending streamed answers. - Adds focused unit coverage for retrieval, metadata filtering, authorization, multimodal messages, references, empty-response behavior, prompt immutability, and mixed embedding models. --------- Co-authored-by: Yingfeng <yingfeng.zhang@gmail.com> Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>