v0.4.1: native embedding CFFI — full pipeline working, daemon-wired, HITL bug fixed

- Native backend returns 768-dim vectors via llama.cpp / C wrapper (/usr/local/lib/libllama_wrap.so)
- Wired :native into embed-object dispatch and exported from passepartout package
- Model preloads at daemon startup with EMBEDDING_PROVIDER=native (~30s)
- Lazy loading via *embedding-backend* :native also works (first call ~45s)
- C wrapper bridges CFFI pointer params to llama.cpp struct-by-value API
- Correct struct layouts: llama_model_params(72B), llama_context_params(136B), llama_batch(56B)
- BERT pooling: llama_get_embeddings_seq, llama_tokenize takes vocab* not model*
- FiveAM tests pass: dimensions, self-similarity, semantic ranking
- Fixed pre-existing HITL crash: boundp guard for *hitl-pending* in core-loop-act
- Lazy load guard prevents double-load of native file in embedding-native-ensure-loaded
- ROADMAP: v0.4.0 items marked DONE, v0.4.1 native embedding updated with actual implementation

org/core-defpackage.org

@@ -116,6 +116,11 @@ The package definition. All public symbols are exported here.
        #:embed-object
        #:embed-all-pending
        #:embedding-backend-hashing
+       #:embedding-backend-native
+       #:embedding-native-load-model
+       #:embedding-native-unload
+       #:embedding-native-ensure-loaded
+       #:embedding-native-get-dim
        #:embeddings-compute
        #:mark-vector-stale
      #:skill