docs(smtp): fix wiring doc examples; align to v1.1.1

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.

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

@@ -1,6 +1,6 @@
 # einherjar/smtp
 
-[![version](https://img.shields.io/badge/version-v1.1.0-5C4EE5?style=flat-square)](https://code.nochebuena.dev/einherjar/smtp)
+[![version](https://img.shields.io/badge/version-v1.1.1-5C4EE5?style=flat-square)](https://code.nochebuena.dev/einherjar/smtp)
 [![license](https://img.shields.io/badge/license-AGPL--3.0-22863A?style=flat-square)](LICENSE)
 [![go](https://img.shields.io/badge/Go-1.26+-00ADD8?style=flat-square&logo=go&logoColor=white)](https://go.dev)
 [![health](https://img.shields.io/badge/health-degraded-E36209?style=flat-square)]()
@@ -19,8 +19,9 @@
 import "code.nochebuena.dev/einherjar/smtp"
 
 mailer := smtp.New(logger, smtp.DefaultConfig())
-launcher.Append(mailer)   // OnInit verifies credentials; OnStop is a no-op
+lc.Append(mailer)   // OnInit verifies credentials; OnStop is a no-op
-health.Register(mailer)   // dial check; LevelDegraded
+// mailer is observability.Checkable (dial check, LevelDegraded):
+srv.Get("/health", health.NewHandler(logger, mailer).ServeHTTP)
 ```
 
 When `cfg.Host` is empty, `New` returns a no-op that logs every `Send` call at debug level and always returns nil. No code changes are needed between environments.

doc.go

@@ -12,8 +12,12 @@
 // # Lifecycle Registration
 //
 //	client := smtp.New(logger, cfg)
-//	launcher.Register(client)
+//	lc.Append(client) // lifecycle: OnInit → OnStop
-//	health.Register(client)
+//
+// client satisfies [observability.Checkable], so it can back a health endpoint via
+// web/health.NewHandler:
+//
+//	srv.Get("/health", health.NewHandler(logger, client).ServeHTTP)
 //
 // # Sending
 //

go.mod

@@ -3,6 +3,6 @@ module code.nochebuena.dev/einherjar/smtp
 go 1.26
 
 require (
-	code.nochebuena.dev/einherjar/contracts v1.1.0
+	code.nochebuena.dev/einherjar/contracts v1.1.1
-	code.nochebuena.dev/einherjar/core v1.1.0
+	code.nochebuena.dev/einherjar/core v1.1.1
 )

go.sum

@@ -1,4 +1,4 @@
-code.nochebuena.dev/einherjar/contracts v1.1.0 h1:GsGr6reyrd9qCc7D8CqbT1LWPTeeK9lT4r4EdsNA5Ro=
+code.nochebuena.dev/einherjar/contracts v1.1.1 h1:MRQUR8Q1D4wIOUIz11vpAdsapWqFTMwr0/VRvWbGO3s=
-code.nochebuena.dev/einherjar/contracts v1.1.0/go.mod h1:ccltUtrFb5+MEJdkx2VVEUL+xC5pupVlVVsMM8AlCWI=
+code.nochebuena.dev/einherjar/contracts v1.1.1/go.mod h1:ccltUtrFb5+MEJdkx2VVEUL+xC5pupVlVVsMM8AlCWI=
-code.nochebuena.dev/einherjar/core v1.1.0 h1:zxj9bFPthEEFRnvWV/vgNZqWa2y/kAo3p5pODWablyk=
+code.nochebuena.dev/einherjar/core v1.1.1 h1:W6V/Peh1ffWjqZnBuBQLn4UGM+bgvWt9MQuktTEfDFw=
-code.nochebuena.dev/einherjar/core v1.1.0/go.mod h1:Ot2JbjsnZ33Ed5C9Ev1kSn2PW+F4dLz/LRwIUh+fYt0=
+code.nochebuena.dev/einherjar/core v1.1.1/go.mod h1:ninuZlnO178zC4rOdt5vjGojnlOpygP8cDorrecAeTY=