[FEATURE] Option to disable auto-attaching the current editor file to the chat input

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

Environment

• Claude Code VS Code Extension
• Host IDE: Google Antigravity (VS Code fork)
• OS: macOS

Current behavior
The chat input always shows a chip for the currently focused editor file
(e.g., report.html). Clicking the chip toggles visibility per-session,
but there is no persistent setting to disable this behavior entirely.

Proposed Solution

Requested
A setting like claudeCode.autoAttachActiveFile: false to permanently
opt out of attaching the active editor file. Users who rely on explicit
@-mentions don't need this auto-context and find the chip noisy.

Alternative Solutions

_No response_

Priority

Medium

Feature Category

IDE integration

Use Case Example

_No response_

Additional Context

_No response_