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

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

chunks/models.py

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+from __future__ import annotations
+from dataclasses import dataclass, field
+
+
+@dataclass
+class Block:
+    id: str
+    kind: str  # paragraph|heading|table|code|list|math|blockquote|html|thematic_break
+    content: str
+    plain_text: str
+    atomic: bool
+    start_line: int
+    end_line: int
+    header_path: list[dict]
+    chars: int
+
+
+@dataclass
+class Chunk:
+    chunk_id: str
+    chunk_index: int
+    content_original: str
+    content_for_embedding: str
+    content_type: str  # section_fragment | atomic_block | overflow
+    chars: int
+    start_line: int
+    end_line: int
+    header_path: list[dict]
+    block_ids: list[str]
+    flags: dict
+    neighbors: dict
+    assets: list = field(default_factory=list)
+
+
+@dataclass
+class Diagnostics:
+    errors: list[str]
+    warnings: list[str]
+    metrics: dict
+
+
+@dataclass
+class ChunkingResult:
+    stem: str
+    source_path: str
+    chunks: list[Chunk]
+    diagnostics: Diagnostics