refactor(evidence): migrate acquisition and preprocessing (#30)

harness/tests/test_corpus_pipeline.py

@@ -116,6 +116,29 @@ def pipeline(tmp_path, source, *, embedder=None, vectors=None, model="model-a",
     )
 
 
+def test_pipeline_routes_source_io_through_evidence_facade(tmp_path, monkeypatch):
+    import tht.evidence.acquisition as evidence_acquisition
+
+    calls = []
+
+    def discover(source):
+        calls.append(("discover", source))
+        return source.discover()
+
+    def acquire(source, source_item):
+        calls.append(("acquire", source_item.source_id))
+        return source.acquire(source_item)
+
+    monkeypatch.setattr(evidence_acquisition, "discover", discover)
+    monkeypatch.setattr(evidence_acquisition, "acquire", acquire)
+    source = Source([(item("one", "a"), "body")])
+
+    result = pipeline(tmp_path, source).run()
+
+    assert result.status == "succeeded"
+    assert calls == [("discover", source), ("acquire", "fs:one")]
+
+
 def test_retention_bounds_generations_and_purges_vectors_after_publish(tmp_path):
     vectors = Vectors()
     generations = []