Replaces old mcp-go based server with core/mcp (brain + agentic).
Single binary: go install ./cmd/core-agent/
Provides: brain_recall, brain_remember, brain_forget, agentic_dispatch,
agentic_status, agentic_resume, agentic_scan, agentic_create_pr, etc.
Co-Authored-By: Virgil <virgil@lethean.io>
