feat: implement core functions

.config/demo_ssh_key

.config/demo_ssh_key.pub

.config/sshd_config

.config/temp_ed25518_key

.config/temp_ed25518_key.pub

.config/temp_rsa_key

.config/temp_rsa_key.pub

.idea/go.imports.xml

.mockery.yaml

cmd/main.go

devenv.nix

error.go

errors.go

event-bus.go

event-bus_test.go

executor.go

executor_test.go

go.mod

go.sum

gob.go