refactor: consolidate duplicate utility functions (#12439)

* refactor: consolidate duplicate utility functions

- Add escapeRegExp to src/utils.ts and remove 10 local duplicates
- Rename bash-tools clampNumber to clampWithDefault (different signature)
- Centralize formatError calls to use formatErrorMessage from infra/errors.ts
- Re-export formatErrorMessage from cli/cli-utils.ts to preserve API

* refactor: consolidate remaining escapeRegExp duplicates

* refactor: consolidate sleep, stripAnsi, and clamp duplicates

extensions/voice-call/src/cli.ts

@@ -2,6 +2,7 @@ import type { Command } from "commander";
 import fs from "node:fs";
 import os from "node:os";
 import path from "node:path";
+import { sleep } from "openclaw/plugin-sdk";
 import type { VoiceCallConfig } from "./config.js";
 import type { VoiceCallRuntime } from "./runtime.js";
 import { resolveUserPath } from "./utils.js";
@@ -40,10 +41,6 @@ function resolveDefaultStorePath(config: VoiceCallConfig): string {
   return path.join(base, "calls.jsonl");
 }
 
-function sleep(ms: number): Promise<void> {
-  return new Promise((resolve) => setTimeout(resolve, ms));
-}
-
 export function registerVoiceCallCli(params: {
   program: Command;
   config: VoiceCallConfig;