[Feature Request] Setting to disable ide_opened_file context on tab switch

Problem

Every time a file tab is selected in VS Code, the extension sends an ide_opened_file context to the conversation. This is extremely disruptive during long coding sessions because:

1. It pollutes the conversation context with irrelevant file paths
2. There is no way to disable it — no setting exists in the extension
3. The user may be browsing files without wanting Claude to react to them
4. It consumes context window space

Proposed Solution

Add a setting claudeCode.sendOpenFileContext (default: true) that allows users to disable the automatic ide_opened_file injection when switching tabs.

Environment

• VS Code extension v2.1.90
• macOS Darwin 25.3.0
• Claude Code CLI