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

tests/test_phase5_models.py

@@ -0,0 +1,30 @@
+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