Add two-profile LoRa operation and radio CLI regression coverage

Implement radio2, tempradio2, radioat2 and tempradioat2 across Mesh roles,
with RX-only/RX+TX operation, optional preambles and persistent cross-TX
policy. Keep temporary OTA traffic on its profile by default and maintain
independent retry ownership and backoff for each profile.

Use slow-first receive scanning with 4.8-symbol visits and automatic
preambles rounded up in steps of eight. Preserve pending RX, restore power
saving on exit, and discard work bound to changed or expired profiles.

Restore the infrastructure path.hash.mode setter and report unsupported
extra.sf settings consistently. Add CLI, scheduling, scan and retry tests,
setup documentation, and the V4/XIAO hardware validation results.

Validation: 1,422 native tests, eight KISS tests, 63 final focused profile
tests, 18 checks from the staged source, sanitizer-enabled OTA transfers,
and builds for V4 Mesh roles, Full XIAO Companion and nRF52 T1000-E.
Hardware checks cover reception, cross-TX policy, expiry, reboot and OTA
discovery while receiving main-channel adverts.

src/Packet.h

@@ -59,6 +59,12 @@ public:
   int8_t _snr;
   uint8_t tx_cr;  // volatile local-only TX coding-rate override; not serialized
   uint8_t flood_retry_policy;  // volatile receive-policy result; not serialized
+  uint32_t radio_generation = 0;
+  uint32_t radio_origin_generation = 0;
+  uint8_t radio_profile = 0;
+  uint8_t radio_origin = 0;
+  bool radio_bound = false;  // retries retain one profile and never fan out again
+  bool radio_local = true;
 
   /**
    * \brief calculate the hash of payload + type