Replace shell-based keychain implementation with keybase/go-keychain library

- Replaced exec.Command calls to /usr/bin/security with native keybase/go-keychain API
- Added comprehensive test suite for keychain operations
- Fixed binary data storage in tests using hex encoding
- Updated macse tests to skip with explanation about ADE requirements
- All tests passing with CGO_ENABLED=1

go.sum

@@ -63,6 +63,8 @@ github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLf
 github.com/jessevdk/go-flags v0.0.0-20141203071132-1679536dcc89/go.mod h1:4FA24M0QyGHXBuZZK/XkWh8h0e1EYbRYJSGM75WSRxI=
 github.com/jessevdk/go-flags v1.4.0/go.mod h1:4FA24M0QyGHXBuZZK/XkWh8h0e1EYbRYJSGM75WSRxI=
 github.com/jrick/logrotate v1.0.0/go.mod h1:LNinyqDIJnpAur+b8yyulnQw/wDuN1+BYKlTRt3OuAQ=
+github.com/keybase/go-keychain v0.0.0-20230307172405-3e4884637dd1 h1:yi1W8qcFJ2plmaGJFN1npm0KQviWPMCtQOYuwDT6Swk=
+github.com/keybase/go-keychain v0.0.0-20230307172405-3e4884637dd1/go.mod h1:qDHUvIjGZJUtdPtuP4WMu5/U4aVWbFw1MhlkJqCGmCQ=
 github.com/kkdai/bstream v0.0.0-20161212061736-f391b8402d23/go.mod h1:J+Gs4SYgM6CZQHDETBtE9HaSEkGmuNXF86RwHhHUvq4=
 github.com/nxadm/tail v1.4.4/go.mod h1:kenIhsEOeOJmVchQTgglprH7qJGnHDVpk1VPCcaMI8A=
 github.com/oklog/ulid/v2 v2.1.1 h1:suPZ4ARWLOJLegGFiZZ1dFAkqzhMjL3J1TzI+5wHz8s=