feat: add DevTools commands (network, console, eval)

[chadrwalters]

Summary

Adds Chrome DevTools-like functionality to the browser CLI, making agent-browse a more complete replacement for Chrome DevTools MCP while maintaining the natural language interaction benefits.

New Commands

Command	Description
browser network [filter]	List captured network requests with optional filtering
browser network-get <id>	Get full request details including response body
browser console [filter]	List console messages with optional filtering
browser eval "<js>"	Evaluate JavaScript in page context
browser clear	Clear captured network/console data

Implementation Details

• Persistence: Network and console data persists across CLI invocations via JSON files (.devtools-network.json, .devtools-console.json)
• Automatic capture: Starts when browser initializes via Network.enable and Runtime.enable
• Filtering: Supports URL, method, type for network; text, type for console
• Output limits: Results capped to prevent context bloat (50 network requests, 100 console messages)

Example Usage

# Navigate and capture network
browser navigate https://example.com

# Check what loaded
browser network

# Filter to just API calls
browser network api

# Check for errors
browser console error

# Evaluate JS in page
browser eval "document.title"

# Clean up captured data
browser clear

Why This Matters

This addresses a gap where agent-browse excels at natural language browser interaction but lacks debugging capabilities. Users previously needed Chrome DevTools MCP for network/console inspection, which is significantly more context-heavy (~30k tokens per snapshot vs ~100 tokens for these commands).

Test Plan

• browser network lists captured requests
• browser network <filter> filters by URL/method/type
• browser console lists captured messages
• browser console <filter> filters by type/text
• browser eval evaluates JS and returns result
• browser clear clears persisted data
• Data persists across CLI invocations
• TypeScript compiles without errors

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