Feature: Add list_browsers and get_browser_info tools to Chrome extension MCP

Problem

When the Claude in Chrome extension is installed on multiple machines (e.g., a Windows dev server and an Ubuntu workstation), there is no way to:

1. List all connected browser instances — you only discover other browsers when tabs_context_mcp fails with "Multiple Chrome extensions connected"
2. Identify which browser you're currently connected to — there's no get_browser_info tool; the browser name only appears in switch_browser responses
3. Choose a specific browser by name — switch_browser broadcasts to all extensions and connects to whichever one clicks "Connect" first (a race condition)

This creates a poor experience in multi-machine setups where the same user has Chrome + Claude extension running on 2+ machines simultaneously.

Current Behavior

tabs_context_mcp → "Multiple Chrome extensions connected" (error, no info about which browsers)
switch_browser → broadcasts, first click wins, returns "Connected to browser X"

No way to enumerate, no way to target.

Proposed Solution

Add two new MCP tools:

list_browsers

Returns all currently connected Chrome extension instances with metadata:

{
  "browsers": [
    { "id": "abc123", "name": "dev.lab.ergonet.pl", "connected": true },
    { "id": "def456", "name": "Chrome on logi.ergonet.pl", "connected": false }
  ],
  "current": "abc123"
}

get_browser_info

Returns info about the currently connected browser:

{
  "id": "abc123",
  "name": "dev.lab.ergonet.pl",
  "userAgent": "Chrome/145.0...",
  "platform": "Win32"
}

Optional: connect_browser (by name/id)

Allow targeting a specific browser without broadcasting:

connect_browser(name="dev.lab.ergonet.pl")

Use Case

Multi-machine development setup:

• Machine A (Windows Server) — primary Claude Code workstation
• Machine B (Ubuntu) — secondary browser for testing/monitoring

Both have Chrome + Claude extension. Today, starting a Claude Code session is a coin flip on which browser connects. With list_browsers, the agent can see both and connect to the correct one deterministically.

Environment

• Claude Code CLI on Windows Server 2025
• Chrome 145 with Claude extension on 2 machines
• superpowers-chrome plugin enabled