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/browser/routes/dispatcher.ts

@@ -1,5 +1,6 @@
 import type { BrowserRouteContext } from "../server-context.js";
 import type { BrowserRequest, BrowserResponse, BrowserRouteRegistrar } from "./types.js";
+import { escapeRegExp } from "../../utils.js";
 import { registerBrowserRoutes } from "./index.js";
 
 type BrowserDispatchRequest = {
@@ -22,10 +23,6 @@ type RouteEntry = {
   handler: (req: BrowserRequest, res: BrowserResponse) => void | Promise<void>;
 };
 
-function escapeRegex(value: string) {
-  return value.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
-}
-
 function compileRoute(path: string): { regex: RegExp; paramNames: string[] } {
   const paramNames: string[] = [];
   const parts = path.split("/").map((part) => {
@@ -34,7 +31,7 @@ function compileRoute(path: string): { regex: RegExp; paramNames: string[] } {
       paramNames.push(name);
       return "([^/]+)";
     }
-    return escapeRegex(part);
+    return escapeRegExp(part);
   });
   return { regex: new RegExp(`^${parts.join("/")}$`), paramNames };
 }