docs: fix Qwen3-Embedding GGUF filename case in README and llm.ts

HuggingFace filenames are case-sensitive. The documented filename
'qwen3-embedding-0.6b-q8_0.gguf' (lowercase) returns 404. The correct
filename is 'Qwen3-Embedding-0.6B-Q8_0.gguf' (original case from the
HuggingFace repo).

Co-Authored-By: Oz <oz-agent@warp.dev>

README.md

@@ -341,7 +341,7 @@ This is useful for multilingual corpora (e.g. Chinese, Japanese, Korean) where
 
 ```sh
 # Use Qwen3-Embedding-0.6B for better multilingual (CJK) support
-export QMD_EMBED_MODEL="hf:Qwen/Qwen3-Embedding-0.6B-GGUF/qwen3-embedding-0.6b-q8_0.gguf"
+export QMD_EMBED_MODEL="hf:Qwen/Qwen3-Embedding-0.6B-GGUF/Qwen3-Embedding-0.6B-Q8_0.gguf"
 
 # After changing the model, re-embed all collections:
 qmd embed -f

src/llm.ts

@@ -192,7 +192,7 @@ export type RerankDocument = {
 
 // HuggingFace model URIs for node-llama-cpp
 // Format: hf:<user>/<repo>/<file>
-// Override via QMD_EMBED_MODEL env var (e.g. hf:Qwen/Qwen3-Embedding-0.6B-GGUF/qwen3-embedding-0.6b-q8_0.gguf)
+// Override via QMD_EMBED_MODEL env var (e.g. hf:Qwen/Qwen3-Embedding-0.6B-GGUF/Qwen3-Embedding-0.6B-Q8_0.gguf)
 const DEFAULT_EMBED_MODEL = process.env.QMD_EMBED_MODEL ?? "hf:ggml-org/embeddinggemma-300M-GGUF/embeddinggemma-300M-Q8_0.gguf";
 const DEFAULT_RERANK_MODEL = "hf:ggml-org/Qwen3-Reranker-0.6B-Q8_0-GGUF/qwen3-reranker-0.6b-q8_0.gguf";
 // const DEFAULT_GENERATE_MODEL = "hf:ggml-org/Qwen3-0.6B-GGUF/Qwen3-0.6B-Q8_0.gguf";