Create pipeline/stages/__init__.py

pipeline/stages/__init__.py

@@ -0,0 +1,7 @@
+"""Pipeline stages S1-S5 per SPEC-PIPELINE-001 Part B."""
+
+from .s1_segment import segment
+from .s2_classify import classify
+from .s3_decompose import decompose
+from .s4_validate import validate_and_score
+from .s5_emit import emit