feat(writer): add Phase5 data models (ContentBlock/ChapterContent/GenerationContext/ChapterSpec)

src/genesis/writer/models.py

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+"""Writer 子系统数据模型（Phase 5）。"""
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from typing import Literal
+
+
+@dataclass
+class ContentBlock:
+    """LLM 生成的内容块。注意：table.headers/caption、list.items/style 在渲染至
+    DocxInjector.Block 时显式丢弃（renderer 中声明并测试）。"""
+
+    block_id: str
+    type: Literal["paragraph", "heading", "table", "list", "note"]
+    level: int | None = None
+    text: str | None = None
+    caption: str | None = None
+    headers: list[str] | None = None
+    rows: list[list[str]] | None = None
+    items: list[str] | None = None
+    style: str | None = None
+    source_uris: list[str] = field(default_factory=list)
+
+
+@dataclass
+class ChapterContent:
+    chapter_id: str
+    version: int
+    title: str
+    blocks: list[ContentBlock]
+
+
+@dataclass
+class ChapterSpec:
+    """template_mapper 产出：驱动 WriterAgent 串行顺序。"""
+
+    chapter_id: str
+    title: str
+    section_placeholder: str | None = None  # 如 "{{section:db_design}}"，无则 None
+
+
+@dataclass
+class GenerationContext:
+    chapter_id: str
+    title: str
+    template_marker: ChapterSpec
+    structured_source: object | None
+    write_rules: list[str]
+    design_rules: list[str]
+    template_styles: set[str]
+    prior_state: object | None = None  # WriterState，避免循环 import 用 object

tests/test_phase5_models.py

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+from dataclasses import FrozenInstanceError
+from genesis.writer.models import ContentBlock, ChapterContent, GenerationContext, ChapterSpec
+
+
+def test_content_block_defaults():
+    b = ContentBlock(block_id="b1", type="paragraph", text="你好")
+    assert b.level is None
+    assert b.source_uris == []
+
+
+def test_chapter_content_holds_blocks():
+    b = ContentBlock(block_id="b1", type="heading", level=2, text="标题")
+    c = ChapterContent(chapter_id="db_design", version=1, title="DB 设计", blocks=[b])
+    assert c.blocks[0].type == "heading"
+    assert c.version == 1
+
+
+def test_generation_context_no_impact_field():
+    ctx = GenerationContext(
+        chapter_id="db_design", title="DB 设计",
+        template_marker=ChapterSpec(chapter_id="db_design", title="DB 设计", section_placeholder="{{section:db_design}}"),
+        structured_source=None, write_rules=["规则1"], design_rules=["规则2"],
+        template_styles={"Heading 1"},
+    )
+    assert not hasattr(ctx, "impact")
+
+
+def test_chapter_spec_placeholder_optional():
+    s = ChapterSpec(chapter_id="x", title="X", section_placeholder=None)
+    assert s.section_placeholder is None