docs(readme): update Observer section for narrow-interface API#49
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Reflects the 0.3.0 observer refactor: BaseObserver marker, nine narrow per-callback interfaces, variadic WithObservers, *XEvent pointer callbacks, and lazy sync.Once-memoized Data() on payloads. Also removes stale references to NopObserver, MultiObserver, the non-existent package-level With* helpers, and the obsolete JSON "context" field name.
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Summary
BaseObservermarker, nine narrow per-callback interfaces, variadicWithObservers,*XEventpointer callbacks, lazysync.Once-memoizedData()on payloads.NopObserver,MultiObserver, and the non-existentgstate.WithObserver[S,E,D]package-level helpers; corrects the JSON marshal example (context→data).