[FEATURE] Bulk installation feature for enabled plugins

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

When cloning a repository to a new machine (including DevContainers and CodeSpaces), I want to automatically install pre-approved plugins.

Proposed Solution

For example, running npm install without specifying a package name will install all dependencies listed in package.json at once.

Similarly, I want claude plugin install --all to automatically install all plugins listed in settings.json that are currently enabled for the project.

The --all option should be usable in combination with the --scope option.

Alternative Solutions

Run the claude plugin install <plugin> command multiple times. But this is redundant.

Priority

Low - Nice to have

Feature Category

CLI commands and flags

Use Case Example

1. Clone the repository into the devcontainer.
2. Run the claude plugin install --all command in the terminal. This can be automated by setting it in the postCreateCommand field of devcontainer.json.
3. All plugins are available from the start without needing to repeatedly run commands or restart claude code.

Additional Context

_No response_