Why: Three firmware push/response codes had no SDK handler — frames fell
through to the "Unhandled" debug log. CONTACT_DELETED (0x8F) carries a
32-byte pubkey from onContactOverwrite(); CONTACTS_FULL (0x90) is a
1-byte push from onContactsFull(); TUNING_PARAMS (23) is the 9-byte
response to CMD_GET_TUNING_PARAMS carrying rx_delay and airtime_factor.
All three now dispatch typed events. Short frames are guarded.
Refs: Forensics report findings N01, N02, N03
Why: PacketType was missing CONTACTS_FULL (0x90), emitted by
MyMesh::onContactsFull(). CommandType was missing GET_STATS (56),
used by get_stats_core/radio/packets but referenced only as literal
b"\\x38". Adding both enum entries prepares for handler and wrapper
implementations in subsequent commits.
Refs: Forensics report findings N02, R04
Matthew Wolter