- provision.py: add --channel (CSI channel override) and --filter-mac
(AA:BB:CC:DD:EE:FF format) arguments with validation
- nvs_config: add csi_channel, filter_mac[6], filter_mac_set fields;
read from NVS on boot
- csi_collector: auto-detect AP channel when no NVS override is set;
filter CSI frames by source MAC when filter_mac is configured
- ADR-060 documents the design and rationale
Fixes#247, fixes#229
rUv