Moves the Go reference implementation to the idiomatic repo-root pkg/ (library)
+ cmd/ (genkat tool) layout, dropping the ref/go/ nesting. Imports become
github.com/luxfi/pulsar/pkg/pulsar. The pulsar DAEMON (formerly the unhomed
standalone github.com/luxfi/pulsard module) now lives canonically at
github.com/luxfi/pulsar/pkg/pulsard. No replace directives.
BREAKING: consumers must update github.com/luxfi/pulsar/ref/go/pkg/... ->
github.com/luxfi/pulsar/pkg/... and bump to v1.9.0.
Co-authored-by: Hanzo Dev <[email protected]>
