docs(worker): fix fictional launcher.Register/health.Register in doc examples (#2)

The package-doc examples showed a fictional launcher.Register / health.Register
API (and launcher.Append as a package func). Corrected to the real wiring:
lc.Append + web/health.NewHandler(...).ServeHTTP.
worker exposes lc.Append only — it is not observability.Checkable, so no health hook.

Documentation-only. No code, API, or dependency changes; version stays v1.1.0
(the v1.1.0 tag is moved to include this fix). Verified by compiling the
corrected pattern against the real API.

Reviewed-on: #2
Co-authored-by: Rene Nochebuena Guerrero <rene@nochebuena.dev>
Co-committed-by: Rene Nochebuena Guerrero <rene@nochebuena.dev>

README.md

@@ -18,7 +18,7 @@
 import "code.nochebuena.dev/einherjar/worker"
 
 w := worker.New(logger, worker.DefaultConfig())
-launcher.Append(w)   // OnInit starts pool; OnStop drains and stops
+lc.Append(w)   // OnInit starts pool; OnStop drains and stops
 ```
 
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