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90ca21432c
Add an optional low-power RX mode: instead of listening continuously, the radio periodically runs a Channel Activity Detection scan and sits in standby between scans; on detected activity it drops into a full receive to catch the packet. Cuts average RX current several-fold (the dominant draw on this node). - RadioLibWrapper: CAD state machine (scan → sleep window → rx) driven from loop(), which runs before recvRaw each cycle. `state` stays STATE_RX through all phases so the dispatcher's not-in-RX watchdog never trips. Re-arm routes through armRecv() in both startRecv() and recvRaw(); toggling on/off switches mode safely at the next idle. Falls back to continuous RX if CAD is unsupported. setPowerSaving()/getPowerSaving() control it. - Software CSMA is already disabled on this firmware (interference threshold 0), so duty-cycling doesn't affect listen-before-talk; airtime budget still gates TX, and isReceivingPacket() still defers TX while a packet is mid-air. - Companion: new rx_powersave pref (schema 0xC0DE0008), Settings › Radio › "Pwr save" toggle, applied at boot (MyMesh) and on change (UITask). CAD window = 45 ms (< the 16-symbol preamble at SF8/BW62.5) and CAD params use RadioLib defaults — both will want on-hardware tuning + a before/after current measurement to confirm reception is intact. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>