refactor(evidence): remove legacy Python layout (#31)

harness/tests/test_evidence_layout.py

@@ -0,0 +1,40 @@
+from pathlib import Path
+
+
+HARNESS_ROOT = Path(__file__).resolve().parents[1]
+LEGACY_PATHS = (
+    "tht/ports/evidence.py",
+    "tht/adapters/evidence",
+    "tht/corpus",
+    "tht/search/evidence.py",
+    "tht/session/artifacts.py",
+)
+LEGACY_REFERENCES = (
+    "tht.ports.evidence",
+    "tht.adapters.evidence",
+    "tht.corpus",
+    "tht.search.evidence",
+    "tht.session.artifacts",
+    "build_evidence_sources",
+    "build_evidence_entries",
+)
+
+
+def test_replaced_evidence_layout_is_removed():
+    remaining = [path for path in LEGACY_PATHS if (HARNESS_ROOT / path).exists()]
+
+    assert remaining == []
+
+
+def test_production_and_tests_use_only_the_evidence_module():
+    offenders = []
+    for root in (HARNESS_ROOT / "tht", HARNESS_ROOT / "tests"):
+        for path in root.rglob("*.py"):
+            if path == Path(__file__).resolve() or "__pycache__" in path.parts:
+                continue
+            contents = path.read_text(encoding="utf-8")
+            matched = [reference for reference in LEGACY_REFERENCES if reference in contents]
+            if matched:
+                offenders.append((path.relative_to(HARNESS_ROOT).as_posix(), matched))
+
+    assert offenders == []