chore: flatten src/ to root

commands/color/index.ts

@@ -0,0 +1,16 @@
+/**
+ * Color command - minimal metadata only.
+ * Implementation is lazy-loaded from color.ts to reduce startup time.
+ */
+import type { Command } from '../../commands.js'
+
+const color = {
+  type: 'local-jsx',
+  name: 'color',
+  description: 'Set the prompt bar color for this session',
+  immediate: true,
+  argumentHint: '<color|default>',
+  load: () => import('./color.js'),
+} satisfies Command
+
+export default color