fix: harden model catalog projections

harness/tests/test_config_resources.py

@@ -214,7 +214,7 @@ embeddings: {provider: ollama_internal, base_url: http://embedding:11434, model:
     assert cfg.vectors.writer.api_key == "writer"
 
 
-def test_accepts_only_internal_ollama_embedding_contract(tmp_path):
+def test_accepts_catalog_selected_internal_ollama_embedding_contract(tmp_path):
     workspace = tmp_path / "workspace.yaml"
     workspace.write_text(
         """
@@ -225,8 +225,9 @@ resources:
   embeddings:
     provider: ollama_internal
     base_url: http://embedding:11434
-    model: qwen3-embedding:0.6b
-    dimensions: 1024
+    id: ollama/bge-m3
+    model: bge-m3
+    dimensions: 1536
 """
     )
 
@@ -234,8 +235,59 @@ resources:
 
     assert cfg.embeddings.provider == "ollama_internal"
     assert cfg.embeddings.base_url == "http://embedding:11434"
-    assert cfg.embeddings.model == "qwen3-embedding:0.6b"
-    assert cfg.embeddings.dim == 1024
+    assert cfg.embeddings.id == "ollama/bge-m3"
+    assert cfg.embeddings.model == "bge-m3"
+    assert cfg.embeddings.dim == 1536
+
+
+def test_installation_embedding_projection_completes_model_free_runtime_source(
+    tmp_path, monkeypatch,
+):
+    monkeypatch.setenv("THT_INTERNAL_EMBEDDING_ID", "ollama/bge-m3")
+    monkeypatch.setenv("THT_INTERNAL_EMBEDDING_MODEL", "bge-m3")
+    monkeypatch.setenv("THT_INTERNAL_EMBEDDING_DIMENSIONS", "1536")
+    workspace = tmp_path / "workspace.yaml"
+    workspace.write_text(
+        """
+dwh:
+  type: postgres_direct
+  connection: {database: analytics, schema: mart, user: reader, password: secret}
+resources:
+  embeddings:
+    provider: ollama_internal
+    base_url: http://embedding:11434
+"""
+    )
+
+    cfg = load_config(workspace)
+
+    assert cfg.embeddings.id == "ollama/bge-m3"
+    assert cfg.embeddings.model == "bge-m3"
+    assert cfg.embeddings.dim == 1536
+
+
+def test_workspace_embedding_values_cannot_override_installation_projection(
+    tmp_path, monkeypatch,
+):
+    monkeypatch.setenv("THT_INTERNAL_EMBEDDING_ID", "ollama/bge-m3")
+    monkeypatch.setenv("THT_INTERNAL_EMBEDDING_MODEL", "bge-m3")
+    monkeypatch.setenv("THT_INTERNAL_EMBEDDING_DIMENSIONS", "1536")
+    workspace = tmp_path / "workspace.yaml"
+    workspace.write_text(
+        """
+dwh:
+  type: postgres_direct
+  connection: {database: analytics, schema: mart, user: reader, password: secret}
+resources:
+  embeddings:
+    provider: ollama_internal
+    base_url: http://embedding:11434
+    model: workspace-owned-model
+"""
+    )
+
+    with pytest.raises(ConfigError, match="proprietà dell'installazione|diverge"):
+        load_config(workspace)
 
 
 def test_accepts_internal_qdrant_resource_contract(tmp_path):