[FEATURE]: CLI tab completions

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

Support CLI completions as other tools

https://en.wikipedia.org/wiki/Command-line_completion

Proposed Solution

I'd like to be able to claude [tab] and se available flags

Alternative Solutions

_No response_

Priority

Low - Nice to have

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

_No response_