[Feature Request] Add diffDisplay setting to control Edit tool output verbosity

Bug Description
Add setting to control Edit tool diff display verbosity

Problem

When the Edit tool runs, the terminal always shows the full colored diff with all added/removed lines. For users who
prefer minimal output, this is noisy—especially for large edits.

Current behavior:
● Update(~/Projects/foo/package.json)
└ Added 10 lines, removed 8 lines
1 {
2 "name": "foo",
3 - "module": "index.ts",
3 "type": "module",
...

The summary line ("Added 10 lines, removed 8 lines") is already there—but the full diff always renders below it.

Proposed Solution

Add a diffDisplay setting with options:

• "full" — Current behavior (default) …

Note: Content was truncated.