feat(chunks): aggiunge models.py con Block, Chunk, Diagnostics, ChunkingResult

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

tests/chunks/test_models.py

@@ -0,0 +1,51 @@
+from chunks.models import Block, Chunk, Diagnostics, ChunkingResult
+
+
+def test_block_creation():
+    b = Block(
+        id="blk_0001",
+        kind="paragraph",
+        content="Testo di esempio.",
+        plain_text="Testo di esempio.",
+        atomic=False,
+        start_line=0,
+        end_line=1,
+        header_path=[{"level": 1, "text": "Titolo"}],
+        chars=17,
+    )
+    assert b.id == "blk_0001"
+    assert b.kind == "paragraph"
+    assert not b.atomic
+    assert b.chars == 17
+
+
+def test_chunk_creation():
+    c = Chunk(
+        chunk_id="chk_000001",
+        chunk_index=1,
+        content_original="Testo.",
+        content_for_embedding="Titolo\n\nTesto.",
+        content_type="section_fragment",
+        chars=6,
+        start_line=0,
+        end_line=1,
+        header_path=[{"level": 1, "text": "Titolo"}],
+        block_ids=["blk_0001"],
+        flags={"has_code": False, "has_table": False, "has_math": False,
+               "is_overflow": False, "is_sparse": False},
+        neighbors={"previous_chunk_id": None, "next_chunk_id": None},
+        assets=[],
+    )
+    assert c.chunk_id == "chk_000001"
+    assert c.assets == []
+
+
+def test_diagnostics_empty():
+    d = Diagnostics(errors=[], warnings=[], metrics={})
+    assert d.errors == []
+
+
+def test_chunking_result():
+    r = ChunkingResult(stem="doc", source_path="sources/doc.md", chunks=[], diagnostics=Diagnostics([], [], {}))
+    assert r.stem == "doc"
+    assert r.chunks == []