feat: add E2E testing bridge with 25 new MCP tools

[sjennings]

Summary

• Adds a WebSocket-based E2E testing bridge that connects the MCP server to running Godot games for live testing
• Implements 25 new MCP tools across 7 categories: connection management, scene tree inspection, game state queries, input simulation, wait/polling, visual verification, and test orchestration
• Includes TestBridge.gd autoload for Godot that runs a WebSocket server inside the game, processing JSON-RPC commands in the game's _process() loop

New files

• src/bridge.ts — WebSocket client + JSON-RPC transport
• src/e2e-tools.ts — 25 tool schemas and handlers
• src/scripts/test_bridge.gd — Godot autoload WebSocket server
• test/fixtures/test-project/ — Test fixture project

Modified files

• src/index.ts — Wires BridgeClient and E2E tools into GodotServer
• package.json — Adds ws dependency
• scripts/build.js — Copies test_bridge.gd to build output
• CLAUDE.md / README.md — Updated documentation

Safety model

• evaluate_expression, wait_for_condition, and dangerous methods in call_method require --unsafe flag
• Singleton names reject path traversal (.., /)
• find_nodes results capped at 1000
• All path inputs validated against .. traversal

Tool categories

Category	Tools
Connection	connect_to_game, disconnect_from_game, get_bridge_status
Orchestration	install_test_bridge, run_project_with_bridge
Scene Tree	get_tree, find_nodes, get_node_properties, set_node_property, call_method
Game State	get_singleton, evaluate_expression, get_performance_metrics
Input	send_key, send_mouse_click, send_mouse_drag, send_text
Waiting	wait_for_signal, wait_for_condition, wait_for_node, wait_for_property
Visual	take_screenshot, get_viewport_info
Scene Control	reset_scene, load_scene

Test plan

• npm run build compiles without errors
• npm run inspector launches and shows all 40 tools
• install_test_bridge registers autoload in project.godot
• run_project_with_bridge launches game and auto-connects
• Scene tree tools return correct node data from a running game
• Input simulation tools produce visible effects in-game
• Wait tools resolve when conditions are met and timeout correctly
• take_screenshot returns valid base64 PNG
• Safety-gated tools reject without --unsafe flag
• Disconnecting cleans up all resources