rod_evaluate always returns <nil> for all scripts

[aliwatters]

Bug Description

rod_evaluate always returns <nil> regardless of the JavaScript expression passed in. This makes it impossible to extract data from pages programmatically.

Steps to Reproduce

1. Start rod-mcp-gui (visible browser mode)
2. Navigate to any page
3. Run rod_evaluate with any JavaScript expression

Examples tried:

rod_evaluate("document.title")           → <nil>
rod_evaluate("1 + 1")                    → <nil>
rod_evaluate("JSON.stringify({a: 1})")   → <nil>
rod_evaluate("document.querySelector('h1')?.textContent") → <nil>

All return <nil> instead of the expected value.

Expected Behavior

rod_evaluate should return the result of the JavaScript expression. For example:

• document.title → the page title string
• 1 + 1 → 2

Environment

• rod-mcp-gui (visible browser mode)
• macOS
• Tested via router-mcp promote_server

Impact

Without working rod_evaluate, there's no way to programmatically extract data from pages — users must rely on rod_snapshot (which truncates long pages) or rod_screenshot (visual only, no data extraction).