feat: harden support, localize knowledge and add operator availability [skip ci]

Source-only publication of reviewed commit 64e96a7f423673dc29ad56485be9fc79bce8af1c.

Passed in isolation: focused frontend/backend tests, race checks, TypeScript typecheck, lint, Go compilation, Flowgram build, and deterministic SDK build/tests.

Not accepted as a production release: Next.js export/native assembly remains blocked by environment memory limits; browser interaction and MySQL staging acceptance remain unverified. No production server, database/schema, runtime configuration, deployment, release tag, or workflow execution was performed.

Expected source tree: 0a4a7528e9.

internal/pkg/eventbus/bus.go

@@ -1,3 +1,4 @@
+// Modified by the independent AgentDesk fork for support reliability and availability.
 package eventbus
 
 import (
@@ -28,6 +29,7 @@ type Bus[T any] struct {
 
 	// 用于限制 PublishAsync 的 goroutine 并发数；nil 表示不限制
 	asyncSem chan struct{}
+	asyncWG  sync.WaitGroup
 }
 
 func New[T any](opts ...Option[T]) *Bus[T] {
@@ -130,10 +132,21 @@ func (b *Bus[T]) Publish(ctx context.Context, event T) error {
 func (b *Bus[T]) PublishAsync(ctx context.Context, event T) {
 	handlers := b.snapshotHandlers()
 	for _, h := range handlers {
-		go b.callHandlerAsync(ctx, h, event)
+		b.asyncWG.Add(1)
+		go func() {
+			defer b.asyncWG.Done()
+			b.callHandlerAsync(ctx, h, event)
+		}()
 	}
 }
 
+// Wait blocks until already-published asynchronous handlers and their error
+// callbacks finish. Stop external publishers before calling Wait; a handler
+// may still publish nested work while its own invocation is pending.
+func (b *Bus[T]) Wait() {
+	b.asyncWG.Wait()
+}
+
 func (b *Bus[T]) HandlerCount() int {
 	b.mu.RLock()
 	defer b.mu.RUnlock()