Replace ASCII-art diagrams across the README and docs/ with editable
.drawio sources plus exported PNGs, so the diagrams render clearly in
rendered markdown and can be maintained/regenerated instead of being
hand-edited as fragile text art. Non-diagram blocks (code, folder
trees, UI wireframes) were left as text.
Remove the LmxProxy work package (WP-8) from phase-3b, the CD-DCL-1..6
protocol details, Q9/Q-P3B-2 from the questions log, the LmxProxy
component-design rows in requirements-traceability, and the inline
mentions across phase-0, phase-4, the gRPC streaming plans, and the
primary/backup data-connection plans.
Covers entity model, failover state machine, health reporting,
UI/CLI changes, and deployment flow for optional backup endpoints
with automatic failover after configurable retry count.
Joseph Doherty