Add clear nvm + Node.js installation instructions and reusable setup script

[Copilot]

Expands the existing "Install Node.js" step in the README with comprehensive nvm installation instructions and adds a reusable setup script to help contributors quickly satisfy the plugin's Node.js requirement.

Changes Made

Enhanced README.md

• Added a new subsection "Installing Node.js via nvm" under step 2 with an anchor link #install-node-with-nvm
• Provides minimal setup commands using nvm v0.40.3 and Node.js 24
• Includes a convenient one-liner for quick installation
• Shows how to pin exact versions (e.g., 24.7.0) for reproducibility
• Adds troubleshooting tips about shell profile configuration and avoiding curly quotes
• References the new helper script for automated setup

New Helper Script

• Created scripts/install-node.sh with executable permissions
• Bash script that idempotently installs or updates nvm and Node.js
• Uses NODE_VERSION environment variable (defaults to 24) for flexibility
• Includes proper error handling with set -euo pipefail
• Outputs node and npm versions for verification
• Can be run as: bash scripts/install-node.sh or NODE_VERSION=24.7.0 bash scripts/install-node.sh

Benefits

• Copy-paste ready: Users can now quickly set up Node.js without guessing
• No sudo required: nvm provides isolated, per-user installation
• Version pinning: Supports both latest and exact version specification
• Automation: Helper script enables reproducible setup in CI/development environments
• Backwards compatible: Existing users are unaffected, new content is additive only

The enhanced instructions provide a reliable path for new contributors while maintaining the existing step numbering and structure.

This pull request was created as a result of the following prompt from Copilot chat.

Add clear nvm + Node.js installation instructions and a reusable setup script to the repository so contributors can quickly satisfy the plugin's Node.js requirement.

Context:
The current README only lists step 2 as: "Install Node.js." This can be expanded to give users a reliable, copy/paste set of commands using nvm (widely used, avoids requiring sudo, and allows version pinning). We will:

Planned changes:

1. README.md
   • Augment Step 2 (Install Node.js) with a new subsection "Installing Node.js via nvm" containing:
     • Minimal commands:
       curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.3/install.sh | bash
       . "$HOME/.nvm/nvm.sh"
       nvm install 24
       node -v
       npm -v
     • Note about optionally pinning an exact version (e.g. 24.7.0) for reproducibility.
     • One-liner form.
     • Troubleshooting note: ensure shell profile sources nvm, and avoid curly quotes.
     • Brief LTS vs current comment (encouraging contributors to match whatever version is documented if changed later).
   • Provide a link anchor so future docs can reference it (#install-node-with-nvm).
2. New script: scripts/install-node.sh
   • Bash script to install (or update) nvm and install a specified Node version (default 24) idempotently.
   • Safe, POSIX-friendly, with NODE_VERSION environment override.
   • Echo resulting node and npm versions.

Script contents (proposed):

#!/usr/bin/env bash
set -euo pipefail

: "${NODE_VERSION:=24}"
NVM_VERSION="v0.40.3"
export NVM_DIR="${NVM_DIR:-$HOME/.nvm}"

if [ ! -s "$NVM_DIR/nvm.sh" ]; then
echo "[install-node] Installing nvm $NVM_VERSION ..." >&2
curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/$NVM_VERSION/install.sh | bash
fi

shellcheck source=/dev/null

. "$NVM_DIR/nvm.sh"

if ! nvm ls "$NODE_VERSION" >/dev/null 2>&1; then
echo "[install-node] Installing Node $NODE_VERSION ..." >&2
nvm install "$NODE_VERSION"
fi
nvm alias default "$NODE_VERSION" >/dev/null
nvm use "$NODE_VERSION" >/dev/null

echo "[install-node] node: $(node -v)" >&2
echo "[install-node] npm: $(npm -v)" >&2

echo "Node environment ready."

README insertion example (markdown snippet to add under Step 2):

Installing Node.js via nvm

If you do not already have Node.js, we recommend using nvm for an isolated, per-user install.

Minimal setup:

curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.3/install.sh | bash
. "$HOME/.nvm/nvm.sh"
nvm install 24
node -v
npm -v

One-liner:

export NVM_DIR="$HOME/.nvm"; [ -s "$NVM_DIR/nvm.sh" ] || curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.3/install.sh | bash; . "$NVM_DIR/nvm.sh"; nvm install 24; node -v; npm -v

Exact version (for reproducibility) – replace with latest 24.x if desired:

nvm install 24.7.0
nvm alias default 24.7.0

Troubleshooting: Make sure your shell profile (e.g. ~/.bashrc or ~/.zshrc) contains the lines the installer appends so nvm is available in new shells. Avoid using curly quotes.

Helper script:
You can also run: bash scripts/install-node.sh (optionally NODE_VERSION=24.7.0 bash scripts/install-node.sh).

Acceptance criteria:

• README.md updated with the above subsection without disrupting existing numbering and content.
• New directory scripts/ (if not present) containing install-node.sh (executable bit set) with the provided logic.
• No other files changed.
• Markdown passes basic lint (no trailing spaces, fenced code blocks correct).

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