feat(viewer): show document summary together with the original (TODO.md L5)

app/api/docs.py

@@ -98,6 +98,7 @@ def get_document_content(
         path=doc.path,
         title=doc.title,
         format=doc_format(doc.path),
+        summary=doc.summary,
         content=doc.content,
         indexed_at=doc.indexed_at.isoformat(),
         chunks=chunks,

app/schemas.py

@@ -105,6 +105,10 @@ class DocContent(BaseModel):
     path: str
     title: str
     format: str
+    #: Lite-model summary (phase 30) — non-markdown A9 docs only; None for
+    #: markdown documents, pre-phase-30 rows, and the fail-soft path where
+    #: summary generation failed but the document was still indexed.
+    summary: str | None = None
     content: str
     indexed_at: str
     chunks: int