[FEATURE] Use intellij indexing in @ autocomplete

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

feature-request-jetbrains-index.md

Proposed Solution

feature-request-jetbrains-index.md

Alternative Solutions

feature-request-jetbrains-index.md

Priority

High - Significant impact on productivity

Feature Category

CLI commands and flags

Use Case Example

feature-request-jetbrains-index.md

Additional Context

feature-request-jetbrains-index.md