CC main button now accepts the current best speed limit source, even if new speed limit source is not flashing.
It snaps cruise speed to match (+ your offset), in either direction.
It works even before engaging longitudinal, so you can pre-set speed limit.
Won't interfere with cars using CC main for Always-On Lateral.
Fix three SLC bugs:
1. Auto-accept limits when not engaged to keep previous_target current.
2. Gate Vision out of the limits dict when not a configured priority slot.
3. Replace mapdOut fallback with 0 when filler has no data to prevent stale OSM speed limits from leaking in.
firestarsdog