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feat: switch gateway and node binaries to AES-256-GCM frame codec (#627)

The gateway and node production binaries were still calling the HMAC
frame codec path (\process_frame\, \un_wake_cycle\) despite the
AEAD functions being available since PR #608-#615. This commit wires
the binaries to the AEAD entry points:

- \gateway.rs\: \process_frame()\ → \process_frame_aead()\
- \
ode.rs\: \un_wake_cycle()\ → \un_wake_cycle_aead()\
  (adds \NodeAead\ provider instantiation)

All ESP-NOW frames (WAKE, COMMAND, APP_DATA, PEER_REQUEST/PEER_ACK)
now use AES-256-GCM authenticated encryption in production.

The BLE pairing path (\sonde-pair-ui\) still uses the ECDH/HMAC
flow — migration deferred to a follow-up (requires a new
\provision_node_aead\ function).

Signed-off-by: Alan Jowett <alan.jowett@microsoft.com>
Co-authored-by: Alan Jowett <alan.jowett@microsoft.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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