feat(chunks): aggiunge segmenter.py — token stream → Block[]

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/chunks/conftest.py

@@ -0,0 +1,15 @@
+import pytest
+from chunks.parser import parse
+from chunks.config import ChunkerConfig
+
+
+@pytest.fixture
+def cfg():
+    return ChunkerConfig()
+
+
+@pytest.fixture
+def parse_md():
+    def _parse(md: str):
+        return parse(md)
+    return _parse