PTY session management, WebSocket streaming, and REST API server for Claude Code conversations

Relay Messenger channel for Claude Code over Relay v1 WebSocket delivery.

Dev-mode pulse for SolidJS apps: flash what really updates (fine-grained computations, component mounts/remounts, DOM mutations, DOM detach/reattach with focus and scroll loss, fetch/WebSocket/SSE lifecycle, Solid Query observers) with an agent-controllab