Add option to disable automatic image attachment from file paths

When I paste an absolute path to an image file (e.g. /Users/me/project/assets/hero.png) in the CLI input, Claude Code automatically reads and attaches the image inline.

The problem: Sometimes I want to give Claude the path as text, not the image itself. For example, when referencing image paths for use in HTML/CSS, discussing file organization, or pointing Claude to assets it should use in code. Wrapping in quotes or backticks doesn't prevent attachment either.

There's also an efficiency concern. Auto-attaching images consumes context window with image data when all I needed was for Claude to know the file path string.

Proposed solution: A setting to disable auto-image-attachment from file paths, something like:

{
  "autoAttachImages": false
}

When disabled, image paths would be treated as plain text. Users could still explicitly ask Claude to read an image via the Read tool when they actually want visual analysis.