0.4.0 - Release

Add durable persistence and typed IPC contracts

This change introduces debounced persistent stores and task queues with crash recovery for the agent, Electron main process, and Roblox Studio host. It adds validation at RPC/IPC boundaries using Pydantic and Zod, refactors Electron main-process logic into service and IPC modules, and exposes typed bridge contracts through preload. The update also stabilizes public payload contracts for runtime config, context snapshots, CoT steps, and tool results, improving durability and boundary safety across the app.