init: add source code from src.zip

src/commands/rewind/index.ts

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+import type { Command } from '../../commands.js'
+
+const rewind = {
+  description: `Restore the code and/or conversation to a previous point`,
+  name: 'rewind',
+  aliases: ['checkpoint'],
+  argumentHint: '',
+  type: 'local',
+  supportsNonInteractive: false,
+  load: () => import('./rewind.js'),
+} satisfies Command
+
+export default rewind

src/commands/rewind/rewind.ts

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+import type { LocalCommandResult } from '../../commands.js'
+import type { ToolUseContext } from '../../Tool.js'
+
+export async function call(
+  _args: string,
+  context: ToolUseContext,
+): Promise<LocalCommandResult> {
+  if (context.openMessageSelector) {
+    context.openMessageSelector()
+  }
+  // Return a skip message to not append any messages.
+  return { type: 'skip' }
+}