Grok Build 1.0.45 hardens remote agents

This is a systems-engineering pass that makes Grok Build more credible for persistent, remotely managed development workflows.

• –Remote Control hardening addresses the security risks of operating agents away from the local terminal.
• –A dedicated permission-rules crate should make allow/deny behavior more consistent across tools and sessions.
• –MCP configuration merging reduces friction when projects, agents, and global settings each provide integrations.
• –Workspace daemon ownership gives folder sandboxing clearer lifecycle and isolation boundaries.
• –The test builder and Agent Host startup work signal investment in repeatable automation, not just interactive demos.