Reflects the feature shipped on this branch: backend can push per-device
CV tuning in the heartbeat response, device validates + persists to NVS.
Removes the stale line_offset row from the operator-provisioning table
(moved into CVTuning, server-managed).
Also adds .agent/, firmware/.pio/, and graphify-out/ to .gitignore so
local working dirs and build artifacts don't get accidentally tracked.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Peter Woolery
cbbdd25ebb