[FEATURE] bash mode tab completion

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

bashmode (!) does not have autocompletion

Proposed Solution

Similar functionality as an ordinary terminal

Alternative Solutions

AI proposed completions

Priority

High - Significant impact on productivity

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

_No response_