chore(all): resolve lint findings, update example plugin, refine docs and add LGPL licenses

go/internal/server/eventtasks/observer_performance_test.go

@@ -49,7 +49,9 @@ func TestObserverUsesInventoryProjectionAndRestoresMemoryOnSaveFailure(t *testin
 	}
 	s.store = store
 	p.count = 1
-	s.BeforeDispatch("/grant", req(1))
+	if err := s.BeforeDispatch("/grant", req(1)); err != nil {
+		t.Fatal(err)
+	}
 	p.count = 2
 	b, e := s.AfterDispatch("/grant", req(1), nil)
 	if e != nil || len(b) == 0 {
@@ -103,7 +105,9 @@ func TestReadOnlyBatchHasNoObserverWritesButRealDeltaNotifiesOnce(t *testing.T)
 	// Even if an upstream replay temporarily exposes the same before/after
 	// delta, the committed request receipt must not increment tasks twice.
 	p.count = 1
-	s.BeforeDispatch("/grant", req(58))
+	if err := s.BeforeDispatch("/grant", req(58)); err != nil {
+		t.Fatal(err)
+	}
 	p.count = 2
 	b, e = s.AfterDispatch("/grant", req(58), nil)
 	if e != nil || len(b) != 0 || counter.writes != 1 {

go/internal/server/eventtasks/service.go

@@ -15,6 +15,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"slices"
 	"sort"
 	"strconv"
 	"sync"
@@ -173,7 +174,7 @@ func key(v ...uint64) string {
 	var k string
 	for i, n := range v {
 		if i > 0 {
-			k += "/"
+			k += "/" //nolint:modernize // stringsbuilder
 		}
 		k += strconv.FormatUint(n, 10)
 	}
@@ -498,7 +499,7 @@ func (s *Service) handle(path string, b []byte, identity string) ([]byte, error)
 					}
 				}
 			}
-			sort.Slice(ids, func(i, j int) bool { return ids[i] < ids[j] })
+			slices.Sort(ids)
 			for _, id := range ids {
 				rewards := s.attendanceRewards(v, a, group, id)
 				if len(rewards) == 0 {
@@ -549,7 +550,7 @@ func (s *Service) handle(path string, b []byte, identity string) ([]byte, error)
 			var u uint64
 			_, _ = fmt.Sscanf(uid, "%d", &u)
 			for g, ids := range groups {
-				sort.Slice(ids, func(i, j int) bool { return ids[i] < ids[j] })
+				slices.Sort(ids)
 				x := wire.AppendVarint(nil, 1, u)
 				x = wire.AppendVarint(x, 2, g)
 				for _, id := range ids {