fix: align contributor pnpm requirement with CI

CONTRIBUTING.md

@@ -7,7 +7,12 @@ Thanks for contributing to CALL-E Integrations.
 This repository targets:
 
 - Node.js `>=22`
-- pnpm `>=10.18.3`
+- pnpm `10.18.3` (the exact version pinned in `packageManager` and CI)
+
+Check `pnpm --version` before installing. If your global pnpm differs, use
+`npx pnpm@10.18.3` in place of `pnpm` for the commands below. Newer pnpm
+versions can use different dependency-build approval settings; this repository
+does not require a pnpm 11 upgrade or a new build-script approval.
 
 Install dependencies from the repository root:
 

README.md

@@ -515,7 +515,7 @@ Broker and MCP requests still create service-side security, audit, and operation
 
 ## Development
 
-Requires Node `>=22` and pnpm `>=10.18.3`, Changesets, and GitHub Actions.
+Requires Node `>=22` and pnpm `10.18.3`, Changesets, and GitHub Actions.
 
 ```bash
 pnpm install

package.json

@@ -4,7 +4,7 @@
   "packageManager": "pnpm@10.18.3",
   "engines": {
     "node": ">=22",
-    "pnpm": ">=10.18.3"
+    "pnpm": "10.18.3"
   },
   "scripts": {
     "test": "pnpm -r --filter \"./packages/*\" run test",