docs: sync Node version references to 20.19+

package.json engines bumped to >=20.19.0 when eslint 10 was merged,
but README badge, CONTRIBUTING, and wiki still advertised Node 18.

Author: hunchom

CONTRIBUTING.md

@@ -39,7 +39,7 @@ All 551 tests should pass before you start.
 
 ## Code style
 
-- Node 18+, ES modules
+- Node 20.19+, ES modules
 - Prefer small, pure functions over class hierarchies
 - Handler files live in `src/tools/` — one file per tool group
 - Every new tool needs an entry in `src/tool-registry.js` and a test file in `tests/`

README.md

@@ -9,7 +9,7 @@
 <p align="center">
   <a href="https://github.com/hunchom/claude-code-ssh/actions/workflows/test.yml"><img src="https://github.com/hunchom/claude-code-ssh/actions/workflows/test.yml/badge.svg" alt="tests"/></a>
   <a href="https://github.com/hunchom/claude-code-ssh/blob/main/LICENSE"><img src="https://img.shields.io/badge/license-MIT-informational?style=flat-square" alt="license"/></a>
-  <img src="https://img.shields.io/badge/node-%E2%89%A518-informational?style=flat-square" alt="node 18+"/>
+  <img src="https://img.shields.io/badge/node-%E2%89%A520.19-informational?style=flat-square" alt="node 20.19+"/>
   <img src="https://img.shields.io/badge/mcp-server-FF6B1A?style=flat-square" alt="mcp server"/>
   <a href="https://www.npmjs.com/package/claude-code-ssh"><img src="https://img.shields.io/npm/v/claude-code-ssh?style=flat-square&color=cb3837&label=npm" alt="npm version"/></a>
 </p>

wiki/Getting-started.md

@@ -6,7 +6,7 @@ Five minutes from zero to Claude running commands on your first host.
 
 | | |
 |---|---|
-| Node.js | 18 or newer (20 recommended — use `.nvmrc`) |
+| Node.js | 20.19 or newer (use `.nvmrc`) |
 | npm | bundled with Node |
 | Claude Code (or OpenAI Codex) | installed and authenticated |
 | SSH access | to at least one host you want to manage |