feat(simulation): add named drive instances

[jlongster]

Summary

• add named drive manifests that assign fixed loopback WebSocket endpoints
• apply simulation layer replacements only when simulation mode is enabled
• start the backend drive WebSocket only when both drive and simulation modes are enabled
• start drive WebSocket servers explicitly instead of through module-load side effects
• update simulation filesystem setup, renderer wiring, and design docs for drive mode

Testing

• bun typecheck in packages/server
• bun typecheck in packages/simulation
• bun typecheck in packages/tui
• repository pre-push typecheck could not complete because packages/cli tsgo was SIGKILLed under local memory pressure; no TypeScript diagnostic was emitted