fix(prose): keep bare numbered replies visible

docs/changes/unreleased/1330-bare-numbered-reply.md

@@ -0,0 +1,17 @@
+---
+kind: fixed
+title: Number-only assistant replies remain visible
+pr: 1330
+# Optional. Which part of the repository this touches, so a reader can skip it.
+# One or more of: build, chat, docs, engine, remote, resident
+surface: [chat]
+# Optional, and the reason this file exists. Every statement that WAS true and is
+# not any more, written whole: what it was, and what it is now. A model reading
+# this has to be able to check its own memory against it, so "branch names" is
+# useless and "the trunk was chat-v3-task and no longer exists; work goes to dev"
+# is the whole point. Leave the list empty if nothing anybody believed changed.
+invalidates: []
+---
+
+The Markdown renderer now keeps an empty ordered-list marker in the transcript,
+so replies such as `32.` are not silently dropped.

internal/tui2/prose/prose_test.go

@@ -164,6 +164,17 @@ func TestOrderedListsShareARightEdge(t *testing.T) {
 	}
 }
 
+// TestABareNumberedReplyStillDraws holds the reply boundary where Markdown
+// parses a number and full stop as an ordered list with an empty item.
+func TestABareNumberedReplyStillDraws(t *testing.T) {
+	for _, src := range []string{"32.", "1024."} {
+		rows := plain(render(t, src, Options{Width: 80}))
+		if got, want := strings.Join(rows, "\n"), src; got != want {
+			t.Errorf("Render(%q) = %q, want %q", src, got, want)
+		}
+	}
+}
+
 // TestBlockquoteCarriesItsGutter checks that the bar runs down EVERY row of the
 // quote including the blank one between its paragraphs — a dashed bar reads as
 // two quotes.

internal/tui2/prose/render.go

@@ -294,6 +294,11 @@ func (r *renderer) list(n *ast.List) {
 		saved := r.push(first, indent)
 		before := len(r.out)
 		r.container(c, !n.IsTight)
+		// A marker with no item body is still source text. Emit the pending
+		// prefix so a reply such as "32." cannot collapse to zero rows.
+		if len(r.out) == before {
+			r.emit(nil)
+		}
 		r.pop(saved, len(r.out) > before)
 	}
 }