chore(relint): relint examples (#462)

Signed-off-by: Frederic BIDON <fredbi@yahoo.com>

Author: fredbi

docs/examples/auth/oauth2/main.go

@@ -127,7 +127,11 @@ func wireOauth2AccessCode() {
 		func(params any) (any, error) {
 			// The bound params struct exposes the raw HTTP request through HTTPRequest.
 			// Untyped: extract from params; typed: it's already a field.
-			r := params.(getCallbackParams).HTTPRequest
+			callbackParams, ok := params.(getCallbackParams)
+			if !ok {
+				panic("internal error")
+			}
+			r := callbackParams.HTTPRequest
 			if r.URL.Query().Get("state") != state {
 				return nil, errors.New(http.StatusBadRequest, "state mismatch")
 			}

docs/examples/auth/oauth2/oauth2

@@ -64,7 +64,8 @@ func main() {
 func submitVariants() {
 	// snippet:submitVariants
 	// legacy — cached context, hard to cancel from the call site
-	result, err := rt.Submit(op) //nolint:ineffassign,wastedassign,staticcheck // doc example: shows legacy form alongside preferred form
+	result, err := rt.Submit(op)
+	use(result, err)
 
 	// preferred — explicit context
 	ctx, cancel := context.WithTimeout(parent, exampleTimeout)
@@ -97,7 +98,8 @@ func migrationForm() {
 	// snippet:migrationForm
 	// before
 	op.Context = ctx
-	result, err := rt.Submit(op) //nolint:ineffassign,wastedassign,staticcheck // doc example: shows before/after migration
+	result, err := rt.Submit(op)
+	use(result, err)
 
 	// after
 	result, err = rt.SubmitContext(ctx, op)

docs/examples/client/requests/main.go

@@ -12,6 +12,7 @@ package main
 
 import (
 	"context"
+	"errors"
 	"io"
 	"log"
 	"net/http"
@@ -132,7 +133,11 @@ func serverUpload() {
 	// snippet:serverUpload
 	api.RegisterOperation("post", "/backups", runtime.OperationHandlerFunc(
 		func(params any) (any, error) {
-			body := params.(putBackupParams).Blob // io.ReadCloser
+			putBackupParams, ok := params.(putBackupParams)
+			if !ok {
+				return nil, errors.New("invalid params")
+			}
+			body := putBackupParams.Blob // io.ReadCloser
 			defer body.Close()
 
 			f, err := os.CreateTemp("", "upload-*")