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.message.ts

@@ -0,0 +1,48 @@
+import { React, h, Box, Text } from './plugins.js';
+
+export interface IChatMessage {
+  role: 'user' | 'assistant' | 'tool';
+  content: string;
+  toolName?: string;
+  toolInput?: string;
+}
+
+interface IMessageProps {
+  message: IChatMessage;
+}
+
+function truncate(text: string, maxLen: number): string {
+  if (text.length <= maxLen) return text;
+  return text.substring(0, maxLen) + '...';
+}
+
+export function Message({ message }: IMessageProps): React.ReactElement | null {
+  switch (message.role) {
+    case 'user':
+      return h(Box, { marginY: 0 },
+        h(Text, { bold: true, color: 'blue' }, 'You: '),
+        h(Text, null, message.content),
+      );
+
+    case 'assistant':
+      return h(Box, { marginY: 0 },
+        h(Text, { bold: true, color: 'green' }, 'Assistant: '),
+        h(Text, null, message.content),
+      );
+
+    case 'tool':
+      return h(Box, { marginY: 0, marginLeft: 2, flexDirection: 'column' as const },
+        h(Text, { dimColor: true },
+          `tool: ${message.toolName}${message.toolInput ? ` (${message.toolInput})` : ''}`,
+        ),
+        message.content
+          ? h(Box, { marginLeft: 2 },
+              h(Text, { dimColor: true }, truncate(message.content, 200)),
+            )
+          : null,
+      );
+
+    default:
+      return null;
+  }
+}