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.inputarea.ts

@@ -0,0 +1,29 @@
+import { React, h, Box, Text, TextInput } from './plugins.js';
+
+interface IInputAreaProps {
+  disabled: boolean;
+  onSubmit: (text: string) => void;
+}
+
+export function InputArea({ disabled, onSubmit }: IInputAreaProps): React.ReactElement {
+  const [value, setValue] = React.useState('');
+
+  const handleSubmit = (text: string) => {
+    if (!text.trim()) return;
+    onSubmit(text.trim());
+    setValue('');
+  };
+
+  return h(
+    Box,
+    { borderStyle: 'single' as const, borderTop: true, borderBottom: false, borderLeft: false, borderRight: false, paddingX: 1 },
+    h(Text, { bold: true, color: disabled ? 'gray' : 'cyan' }, '> '),
+    h(TextInput, {
+      value,
+      onChange: setValue,
+      onSubmit: handleSubmit,
+      placeholder: disabled ? 'Waiting for response...' : 'Type a message...',
+      focus: !disabled,
+    }),
+  );
+}