Add OS Support for os400/ ibm i

### Describe the feature or problem you'd like to solve

Add os Support for os400/ ibm i in ibm i pase enviroment

### Proposed solution

Add mutch needed agentic ai capabilities to ibmi pase enviroment currently only ibm has ai support for ibm i.

nodejs24 is avaidable on ibmi pase can it can install copilot for now it crashes with clipboard and spawning interactive shell but that should be fixable

### Example prompts or workflows

_No response_

### Additional context

_No response_

The issue names no files, tests, or entry points. Start by investigating Copilot CLI installation and reproduction on the IBM i PASE environment with Node.js 24, focusing on the reported clipboard and interactive-shell crashes. Done means documented OS support with those failures addressed, but the issue does not define acceptance tests.

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