feat(chunks): aggiunge ChunkerConfig dataclass

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

tests/chunks/test_config.py

@@ -0,0 +1,29 @@
+from chunks.config import ChunkerConfig
+
+
+def test_default_values():
+    c = ChunkerConfig()
+    assert c.max_chars == 1200
+    assert c.min_chars == 80
+    assert c.target_chars == 800
+    assert c.context_depth == 3
+    assert "indice" in c.skip_headings
+    assert c.skip_pre_heading is True
+    assert c.merge_short is True
+    assert "table" in c.atomic_types
+    assert "code" in c.atomic_types
+
+
+def test_custom_values():
+    c = ChunkerConfig(max_chars=2000, min_chars=100, context_depth=2)
+    assert c.max_chars == 2000
+    assert c.min_chars == 100
+    assert c.context_depth == 2
+
+
+def test_skip_headings_case_insensitive_check():
+    c = ChunkerConfig()
+    skip_lower = {h.lower() for h in c.skip_headings}
+    assert "indice" in skip_lower
+    assert "sommario" in skip_lower
+    assert "bibliografia" in skip_lower