feat: add headed/headless mode option to test-browser

- Add Step 0 asking user if they want to watch browser tests
- Headed mode opens visible browser window
- Headless mode runs faster in background
- Bump version to 2.25.0

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

plugins/compound-engineering/commands/test-browser.md

@@ -43,6 +43,22 @@ See the `agent-browser` skill for detailed usage.
 
 ## Main Tasks
 
+### 0. Ask Browser Mode
+
+<ask_browser_mode>
+
+Before starting tests, ask user if they want to watch the browser:
+
+Use AskUserQuestion with:
+- Question: "Do you want to watch the browser tests run?"
+- Options:
+  1. **Headed (watch)** - Opens visible browser window so you can see tests run
+  2. **Headless (faster)** - Runs in background, faster but invisible
+
+Store the choice and use `--headed` flag when user selects "Headed".
+
+</ask_browser_mode>
+
 ### 1. Determine Test Scope
 
 <test_target> $ARGUMENTS </test_target>