feat(writer): add WriteOrchestrator.generate (vertical slice, real DocxInjector.inject)

tests/test_phase5_writer_orchestrator.py

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+import pytest
+from types import SimpleNamespace
+from docx import Document
+
+from genesis.data_models import ParsedTemplate, ChapterMarker
+from genesis.writer.orchestrator import WriteOrchestrator
+from genesis.writer.models import ChapterContent
+
+
+class FakeEngine:
+    def chat_structured(self, *, session_id, prompt, variables, schema, retry_count=2):
+        # 返回一个固定章节内容（title + 一个段落块）
+        return SimpleNamespace(
+            data={"title": variables["title"], "blocks": [{"type": "paragraph", "text": "自动生成的内容"}]},
+            status="ok",
+        )
+
+
+def _make_template(path):
+    doc = Document()
+    doc.add_paragraph("はじめに", style="Heading 1")
+    doc.add_paragraph("{{section:introduction}}")
+    doc.save(path)
+
+
+def _ss(template_path):
+    parsed = ParsedTemplate(
+        file_name=template_path,
+        sections=[
+            ChapterMarker(type="heading", name="はじめに", level=1),
+            ChapterMarker(type="placeholder", name="section:introduction", level=0),
+        ],
+        placeholders={},
+        styles={"defined": ["Heading 1"], "used": ["Heading 1"]},
+    )
+    return SimpleNamespace(template=parsed)
+
+
+def test_generate_produces_filled_docx(tmp_path):
+    tpl = tmp_path / "tpl.docx"
+    out = tmp_path / "out.docx"
+    _make_template(str(tpl))
+    orch = WriteOrchestrator()
+    contents = orch.generate(_ss(str(tpl)), str(out), samples_dir="nonexistent_dir_xyz", engine=FakeEngine())
+    assert isinstance(contents, list) and len(contents) == 1
+    # 输出 docx 含注入文本且无残留异常
+    loaded = Document(str(out))
+    joined = "\n".join(p.text for p in loaded.paragraphs)
+    assert "自动生成的内容" in joined