Feature Request: Add setting to disable automatic ide_opened_file context

Problem

In VS Code extension, files opened in the IDE are automatically included as context (via ide_opened_file tag). This can cause unintended behavior when the AI interprets open files as implicit instructions.

Use Case

• User has a session file open for reference
• AI mistakenly continues that session instead of creating a new one
• No way to disable this behavior without switching to terminal mode

Proposed Solution

Add a VS Code extension setting:

| Setting | Description |
|---------|-------------|
| Name | Include Open Files as Context or similar |
| Default | true (current behavior) |
| When false | ide_opened_file tags are not sent to the model |

Current Workaround

Using CLAUDE.md instructions to explicitly ignore ide_opened_file, but a native setting would be more reliable.

Environment

• VS Code Extension on Windows
• Claude Code version: latest