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

src/channels/dock.ts

@@ -18,7 +18,7 @@ import { resolveSignalAccount } from "../signal/accounts.js";
 import { resolveSlackAccount, resolveSlackReplyToMode } from "../slack/accounts.js";
 import { buildSlackThreadingToolContext } from "../slack/threading-tool-context.js";
 import { resolveTelegramAccount } from "../telegram/accounts.js";
-import { normalizeE164 } from "../utils.js";
+import { escapeRegExp, normalizeE164 } from "../utils.js";
 import { resolveWhatsAppAccount } from "../web/accounts.js";
 import { normalizeWhatsAppTarget } from "../whatsapp/normalize.js";
 import {
@@ -76,8 +76,6 @@ const formatLower = (allowFrom: Array<string | number>) =>
     .filter(Boolean)
     .map((entry) => entry.toLowerCase());
 
-const escapeRegExp = (value: string) => value.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
-
 // Channel docks: lightweight channel metadata/behavior for shared code paths.
 //
 // Rules: