layer1: add namespace part helpers step 14

doc/thinking/2026-04-26-namespace-manager-step14.md

@@ -0,0 +1,19 @@
+# 2026-04-26 — NamespaceManager rewrite, step 14
+
+## Цель шага
+
+Добавить удобные helper-методы для part-state transitions.
+
+## Что меняем
+
+1. В manager interface добавляем:
+   - `MarkPartRegistering()`
+   - `MarkPartActive()`
+   - `MarkPartFailed()`
+2. Реализуем их поверх `MarkPartState()`.
+3. Добавляем unit tests.
+
+## Что НЕ меняем
+
+- не подключаем helpers к runtime reconcile;
+- не трогаем watcher-ы и runtime components.

pkg/utils/namespace_manager.go

@@ -19,6 +19,9 @@ type NamespaceManager interface {
 	SnapshotSubscribers() []string
 	Upsert(event NamespaceEvent) NamespaceRecord
 	MarkPartState(namespace string, part string, state NamespacePartState) (NamespaceRecord, bool)
+	MarkPartRegistering(namespace string, part string) (NamespaceRecord, bool)
+	MarkPartActive(namespace string, part string) (NamespaceRecord, bool)
+	MarkPartFailed(namespace string, part string, err error) (NamespaceRecord, bool)
 	Remove(name string) bool
 }
 
@@ -184,6 +187,22 @@ func (m *inMemoryNamespaceManager) MarkPartState(namespace string, part string,
 	return record.Clone(), true
 }
 
+func (m *inMemoryNamespaceManager) MarkPartRegistering(namespace string, part string) (NamespaceRecord, bool) {
+	return m.MarkPartState(namespace, part, NamespacePartState{State: NamespacePartStateRegistering})
+}
+
+func (m *inMemoryNamespaceManager) MarkPartActive(namespace string, part string) (NamespaceRecord, bool) {
+	return m.MarkPartState(namespace, part, NamespacePartState{State: NamespacePartStateActive})
+}
+
+func (m *inMemoryNamespaceManager) MarkPartFailed(namespace string, part string, err error) (NamespaceRecord, bool) {
+	lastError := ""
+	if err != nil {
+		lastError = err.Error()
+	}
+	return m.MarkPartState(namespace, part, NamespacePartState{State: NamespacePartStateFailed, LastError: lastError})
+}
+
 func (m *inMemoryNamespaceManager) Remove(name string) bool {
 	m.mu.Lock()
 	defer m.mu.Unlock()

pkg/utils/namespace_manager_test.go

@@ -1,6 +1,7 @@
 package utils
 
 import (
+	"errors"
 	"reflect"
 	"testing"
 	"time"
@@ -159,6 +160,29 @@ func TestNamespaceManagerBootstrap(t *testing.T) {
 	}
 }
 
+func TestNamespaceManagerPartStateHelpers(t *testing.T) {
+	manager := NewNamespaceManager()
+	manager.Upsert(NamespaceEvent{Type: NamespaceEventAdd, Name: "tenant-a", Source: NamespaceSourceWatcher})
+
+	record, ok := manager.MarkPartRegistering("tenant-a", "router")
+	if !ok || record.Phase != NamespacePhaseRegistering {
+		t.Fatalf("expected registering helper to set registering phase")
+	}
+
+	record, ok = manager.MarkPartActive("tenant-a", "router")
+	if !ok || record.Phase != NamespacePhaseActive {
+		t.Fatalf("expected active helper to set active phase")
+	}
+
+	record, ok = manager.MarkPartFailed("tenant-a", "router", errors.New("boom"))
+	if !ok || record.Phase != NamespacePhaseFailed {
+		t.Fatalf("expected failed helper to set failed phase")
+	}
+	if record.RegisteredParts["router"].LastError != "boom" {
+		t.Fatalf("expected failed helper to persist error")
+	}
+}
+
 func TestNewBootstrappedNamespaceManager(t *testing.T) {
 	resolver := &NamespaceResolver{
 		FissionResourceNS: map[string]string{