docs: add Node 18-24 requirement, warn about Node 25+ incompatibility

Node 25 removed SlowBuffer from the buffer module, crashing the
transitive dependency buffer-equal-constant-time (via jsonwebtoken).
This breaks sf provar auth *, lint, and tests.

- package.json engines: cap at <25.0.0
- README: Node version note in Installation section
- docs/mcp.md: add Prerequisites section with Node requirement
- docs/mcp-pilot-guide.md: update Node row to 18-24 with warning

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: mrdailey99

README.md

@@ -11,6 +11,8 @@ The Provar DX CLI is a Salesforce CLI plugin for Provar customers who want to au
 
 # Installation, Update, and Uninstall
 
+**Requires Node.js 18–24 (LTS 22 recommended).** Node 25+ is not yet supported due to a breaking change in a transitive dependency. Check with `node --version`.
+
 Install the plugin
 
 ```sh-session

docs/mcp-pilot-guide.md

@@ -27,7 +27,7 @@ The server runs **locally on your machine**. It does not phone home, transmit yo
 | Salesforce CLI (`sf`)       | ≥ 2.x   | `npm install -g @salesforce/cli`                                                                                                  |
 | Provar DX CLI plugin        | ≥ 1.5.0 | `sf plugins install @provartesting/provardx-cli@beta`                                                                                  |
 | An MCP-compatible AI client | —       | Claude Desktop, Claude Code, or Cursor                                                                                            |
-| Node.js                     | ≥ 18    | Installed automatically with the SF CLI                                                                                           |
+| Node.js                     | 18–24   | Installed automatically with the SF CLI. **Node 25+ is not supported** — a transitive dependency crashes on startup. Use Node 22 LTS. |
 
 ---
 

docs/mcp.md

@@ -57,6 +57,11 @@ The Provar DX CLI ships with a built-in **Model Context Protocol (MCP) server**
 
 ---
 
+## Prerequisites
+
+- **Node.js 18–24** (LTS 22 recommended). Node 25+ is not supported — a transitive dependency (`buffer-equal-constant-time`) crashes on startup. Check with `node --version`.
+- **Salesforce CLI** (`sf`) ≥ 2.x
+
 ## Starting the server
 
 ```sh

package.json

@@ -35,7 +35,7 @@
     "wireit": "^0.14.0"
   },
   "engines": {
-    "node": ">=18.0.0"
+    "node": ">=18.0.0 <25.0.0"
   },
   "files": [
     "/lib",