refactor(ebook-search): simplify search and phrase matching

tests/ebook_search/test_core.py

@@ -25,7 +25,7 @@ from python.ebook_search.bm25_corpus import (
     score_bm25_corpus,
     write_bm25_corpus,
 )
-from python.ebook_search.config import EbookSearchConfig, RerankConfig, load_config, normalize_embedding_model
+from python.ebook_search.config import EbookSearchConfig, RerankConfig, load_config
 from python.ebook_search.embeddings import MODEL_DIMENSIONS, ensure_embedding_models
 from python.ebook_search.ingest import chunk_text, find_existing_source
 from python.ebook_search.search import (
@@ -452,24 +452,25 @@ def test_1024_embedding_table_has_cosine_hnsw_index() -> None:
 
 def test_embedding_model_aliases_normalize_to_provider_names(mocker: MockerFixture) -> None:
     mocker.patch.dict(environ, {}, clear=False)
+    environ.pop("EBOOK_SEARCH_EMBEDDING_MODEL", None)
 
-    assert normalize_embedding_model() == "qwen3-embedding-0.6b"
+    assert load_config().embedding_model == "qwen3-embedding-0.6b"
 
     environ["EBOOK_SEARCH_EMBEDDING_MODEL"] = "qwen3-embedding-0.6b"
-    assert normalize_embedding_model() == "qwen3-embedding-0.6b"
+    assert load_config().embedding_model == "qwen3-embedding-0.6b"
 
     environ["EBOOK_SEARCH_EMBEDDING_MODEL"] = "Qwen3-Embedding-0.6B"
-    assert normalize_embedding_model() == "qwen3-embedding-0.6b"
+    assert load_config().embedding_model == "qwen3-embedding-0.6b"
 
     environ["EBOOK_SEARCH_EMBEDDING_MODEL"] = "Qwen/Qwen3-Embedding-4B"
 
-    assert normalize_embedding_model() == "qwen3-embedding-4b"
+    assert load_config().embedding_model == "qwen3-embedding-4b"
 
     environ["EBOOK_SEARCH_EMBEDDING_MODEL"] = "qwen3-embedding:8b"
-    assert normalize_embedding_model() == "qwen3-embedding-8b"
+    assert load_config().embedding_model == "qwen3-embedding-8b"
 
     environ["EBOOK_SEARCH_EMBEDDING_MODEL"] = "qwen3-embedding-8b"
-    assert normalize_embedding_model() == "qwen3-embedding-8b"
+    assert load_config().embedding_model == "qwen3-embedding-8b"
 
 
 def test_answer_generation_is_enabled_by_default(mocker: MockerFixture) -> None: