feat(initial): scaffold @push.rocks/smartchat with core, CLI, and web layers

Three-layer architecture built on @push.rocks/smartagent:
- ts/ — ChatSession wrapping runAgent() with conversation state management
- ts_cli/ — ink-based terminal chat TUI (React.createElement, no JSX)
- ts_web/ — Lit web components (smartchat-window, smartchat-message, smartchat-input)

ts_cli/components.messagelist.ts

@@ -0,0 +1,45 @@
+import { React, h, Box, Text } from './plugins.js';
+import { Message, type IChatMessage } from './components.message.js';
+
+interface IMessageListProps {
+  messages: IChatMessage[];
+  streamingText: string;
+  busy: boolean;
+}
+
+export function MessageList({ messages, streamingText, busy }: IMessageListProps): React.ReactElement {
+  const children: React.ReactNode[] = [];
+
+  if (messages.length === 0 && !busy) {
+    children.push(
+      h(Box, { justifyContent: 'center', marginY: 1, key: 'empty' },
+        h(Text, { dimColor: true }, 'Type a message to start chatting.'),
+      ),
+    );
+  }
+
+  for (let i = 0; i < messages.length; i++) {
+    children.push(h(Message, { key: `msg-${i}`, message: messages[i]! }));
+  }
+
+  if (busy && streamingText) {
+    children.push(
+      h(Box, { marginY: 0, key: 'streaming' },
+        h(Text, { bold: true, color: 'green' }, 'Assistant: '),
+        h(Text, null, streamingText),
+        h(Text, { dimColor: true }, '\u2588'),
+      ),
+    );
+  }
+
+  if (busy && !streamingText) {
+    children.push(
+      h(Box, { marginY: 0, key: 'spinner' },
+        h(Text, { color: 'yellow' }, '\u25CF'),
+        h(Text, { dimColor: true }, ' Thinking...'),
+      ),
+    );
+  }
+
+  return h(Box, { flexDirection: 'column' as const, flexGrow: 1 }, ...children);
+}