feat(firmware): --channel and --filter-mac provisioning (ADR-060)

[ruvnet]

Summary

• Add --channel argument to provision.py for explicit CSI channel override (fixes managed network mismatch)
• Add --filter-mac argument to provision.py for MAC-based CSI frame filtering
• Auto-detect connected AP channel when no NVS override is set
• Filter CSI frames by source MAC in the callback when configured
• ADR-060 documents the design

Usage

# Set CSI channel to match your AP (e.g. channel 11)
python provision.py --port COM7 --channel 11

# Filter CSI to a specific AP MAC
python provision.py --port COM7 --filter-mac "AA:BB:CC:DD:EE:FF"

# Both together
python provision.py --port COM7 --channel 11 --filter-mac "AA:BB:CC:DD:EE:FF"

Changes

File	Change
provision.py	New --channel and --filter-mac args with validation
nvs_config.h	Add csi_channel, filter_mac[6], filter_mac_set fields
nvs_config.c	Read csi_channel (u8) and filter_mac (6-byte blob) from NVS
csi_collector.c	Auto-detect AP channel; MAC filter in CSI callback
ADR-060	Architecture decision record

Fixes #247, fixes #229

Test plan

• Flash firmware with --channel 11 on a channel-11 network, verify CSI flows
• Flash with --filter-mac set to AP BSSID, verify only matching frames pass
• Flash without either flag, verify auto-channel detection from connected AP
• Verify backward compatibility (no NVS keys = same behavior as before)

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