Add install.js installer script

[Mopskopf]

Why

Add a small local installer to simplify developer setup: it registers the Open Plugins marketplace and installs plugins for Claude Code and GitHub Copilot so contributors can get started quickly.

Approach

This commit adds install.js (an installer script). The script detects required CLIs, registers and updates the marketplace, enables auto-update, and installs the plugins listed in the marketplace manifest.

Notes and review guidance

• The file was downloaded during the session and committed to the repository root. If preferred, move it into scripts/ or remove the root copy; this PR can be adjusted accordingly.
• This is a convenience developer script; reviewers may want to vet security/supply-chain concerns before accepting.

N/A

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[Mopskopf]

CI is blocked on this PR: required checks (validate-keyword-case, validate-repository-metadata) show 'action_required' and the license/cla check is queued. I do not have admin rights in this repo to rerun workflows. Please re-run the workflows or advise how to proceed (or maintainers, could you re-run the required checks?).

[Copilot]

Pull request overview

This PR adds a Node.js-based installer script intended to simplify local contributor setup by registering the repository marketplace and installing all plugins for Claude Code and/or the GitHub Copilot CLI.

Changes:

• Adds a root-level install.js installer script that registers/updates the marketplace and installs all plugins from marketplace.json.
• Includes logic to enable marketplace auto-update by patching the relevant CLI config files.
• Includes prerequisite checks and optional installs/updates for pac (via dotnet) and az (via winget/brew).

Suppressed comments (1)

install.js:123

• This file is committed at the repo root, but the marketplace discovery logic assumes the script lives under scripts/ (repoRoot = path.resolve(scriptDir, "..")). If a user runs node /path/to/repo/install.js from a different working directory, process.cwd() won’t be the repo and the script may fail to find marketplace.json locally. Prefer treating scriptDir itself as a candidate repo root (and optionally also .. for the scripts/ case).

  const scriptDir = process.argv[1] ? path.dirname(path.resolve(process.argv[1])) : process.cwd();
  // Script lives in scripts/, so the repo root is one level up
  const repoRoot = path.resolve(scriptDir, "..");
  const roots = [...new Set([repoRoot, process.cwd()])];

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[Priyanshu Agrawal (priyanshu92)]

Hi Mopskopf,

1. Can you please create an issue first which this PR is addressing?
2. How is this different from scripts/install.js already in this repo?