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Laan Tungir 024b490ac1 Add nostr_signer_derive_hmac() (HMAC-SHA256 via local + nsigner derive verb) and ttyUSB serial enumeration
Rescued from uncommitted work in sovereign_browser/nostr_core_lib:
- nostr_signer_derive_hmac(): deterministic MAC over caller data using the
  signer's secp256k1 private key. Local backend computes HMAC-SHA256 directly;
  remote nsigner backend calls the 'derive' verb (algorithm:'secp256k1').
- nsigner_transport_list_serial(): enumerate /dev/ttyUSB* (FTDI/CH340/CP210x/
  PL2303 USB-serial adapters) in addition to /dev/ttyACM* CDC-ACM devices.
- tests/nsigner_client_test.c: local derive_hmac reference-match test.
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