fix: release script grep -P macOS compat and CLI typecheck actor errors

- Replace grep -P (Perl regex, unavailable on macOS) with sed for
  extracting the CLI version string in release.sh
- Add triple-slash reference to server/src/types/express.d.ts in
  server/src/index.ts so CLI's tsc picks up the Express Request
  augmentation when following workspace links

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/index.ts

@@ -1,3 +1,4 @@
+/// <reference path="./types/express.d.ts" />
 import { existsSync, readFileSync, rmSync } from "node:fs";
 import { createServer } from "node:http";
 import { resolve } from "node:path";