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.statusbar.ts

@@ -0,0 +1,31 @@
+import { React, h, Box, Text } from './plugins.js';
+import type { IChatUsage } from './plugins.js';
+
+interface IStatusBarProps {
+  modelName?: string;
+  usage: IChatUsage;
+  busy: boolean;
+}
+
+export function StatusBar({ modelName, usage, busy }: IStatusBarProps): React.ReactElement {
+  const children: React.ReactNode[] = [
+    h(Text, { dimColor: true, key: 'model' }, modelName ? `model: ${modelName}` : 'smartchat'),
+    h(Text, { dimColor: true, key: 'sep1' }, ' | '),
+    h(Text, { dimColor: true, key: 'tokens' }, `tokens: ${usage.totalTokens.toLocaleString()}`),
+    h(Text, { dimColor: true, key: 'sep2' }, ' | '),
+    h(Text, { dimColor: true, key: 'turns' }, `turns: ${usage.turns}`),
+  ];
+
+  if (busy) {
+    children.push(
+      h(Text, { dimColor: true, key: 'sep3' }, ' | '),
+      h(Text, { color: 'yellow', key: 'thinking' }, 'thinking...'),
+    );
+  }
+
+  return h(
+    Box,
+    { borderStyle: 'single' as const, borderTop: true, borderBottom: false, borderLeft: false, borderRight: false, paddingX: 1 },
+    ...children,
+  );
+}