feat(writer): add renderer (ChapterContent -> DocxInjector.Block)

src/genesis/writer/renderer.py

@@ -0,0 +1,25 @@
+"""渲染：ChapterContent 的 ContentBlock 序列 → DocxInjector.Block 序列（Phase 5）。
+
+字段塌缩（外视 #6）：table.headers/caption、list.items/style 在渲染时显式丢弃，
+仅保留 DocxInjector.Block 支持的 (kind, text, level, rows)。
+"""
+from __future__ import annotations
+
+from genesis.writer.docx_injector import Block
+from genesis.writer.models import ChapterContent
+
+
+def render_chapter_blocks(content: ChapterContent) -> list[Block]:
+    out: list[Block] = []
+    for b in content.blocks:
+        if b.type == "heading":
+            out.append(Block(kind="heading", text=b.text or b.caption or "", level=b.level or 1))
+        elif b.type == "table":
+            out.append(Block(kind="table", text=b.caption or "", rows=b.rows or []))
+        elif b.type == "list":
+            out.append(Block(kind="list", text="\n".join(b.items or [])))
+        elif b.type == "note":
+            out.append(Block(kind="note", text=b.text or b.caption or ""))
+        else:  # paragraph 及未知类型
+            out.append(Block(kind="paragraph", text=b.text or b.caption or ""))
+    return out