Let a Proxy finish deleting when its instance can no longer be reached

reconcileDelete asked Get first and dropped the finalizer only on
not-found, so a permanent Get retried forever: a KVM host removed from
the config, or a providerID the provider cannot resolve, left the Proxy
in Terminating with no way out. It now tries Delete anyway, which is
idempotent and can still finish where Get cannot converge, and releases
the object when that succeeds.

crawl.example.com/skip-cleanup abandons the instance for the cases that
stay stuck, such as revoked credentials. It is checked before the
provider lookup, so it also frees a Proxy whose provider is gone from
the config.

In the KVM provider, Delete over an unconfigured host is now a no-op
success, mirroring removeVolumes over a missing pool. Get keeps failing
permanently there on purpose: the live path reads not-found as "rebuild
it", so a typo in hosts must not look like a missing VM.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

internal/controller/reconcile_test.go

@@ -2,6 +2,7 @@ package controller
 
 import (
 	"context"
+	"slices"
 	"testing"
 	"time"
 
@@ -78,6 +79,10 @@ func notFoundErr() error {
 	return provider.Wrap(provider.ErrNotFound, "get", "stub", "some-id", nil)
 }
 
+func permanentErr() error {
+	return provider.Wrap(provider.ErrPermanent, "get", "stub", "some-id", nil)
+}
+
 func testScheme(t *testing.T) *runtime.Scheme {
 	t.Helper()
 	s := runtime.NewScheme()
@@ -125,6 +130,15 @@ func withSpecHashAnnotation(hash string) func(*crawlv1alpha1.Proxy) {
 	}
 }
 
+func withSkipCleanup() func(*crawlv1alpha1.Proxy) {
+	return func(p *crawlv1alpha1.Proxy) {
+		if p.Annotations == nil {
+			p.Annotations = map[string]string{}
+		}
+		p.Annotations[crawlv1alpha1.AnnotationSkipCleanup] = "true"
+	}
+}
+
 func deleting() func(*crawlv1alpha1.Proxy) {
 	return func(p *crawlv1alpha1.Proxy) {
 		now := metav1.Now()
@@ -375,6 +389,59 @@ func TestReconcile_actionTable(t *testing.T) {
 				assertProxyGone(t, r)
 			},
 		},
+		{
+			// A permanent Get (a retired KVM host, a providerID the provider
+			// cannot resolve) used to retry forever with the finalizer on.
+			name:       "deletion with an unreachable instance still deletes and releases",
+			proxy:      managedProxy(deleting(), withProviderID("stub-id-1")),
+			stub:       &stubProvider{getErr: permanentErr()},
+			wantResult: ctrl.Result{},
+			verify: func(t *testing.T, r *ProxyReconciler, stub *stubProvider) {
+				assertProxyGone(t, r)
+				if stub.deleteCalls != 1 {
+					t.Errorf("deleteCalls = %d, want 1 — Delete must be tried when Get cannot answer", stub.deleteCalls)
+				}
+			},
+		},
+		{
+			name:  "deletion keeps the finalizer when cleanup itself fails",
+			proxy: managedProxy(deleting(), withProviderID("stub-id-1")),
+			stub: &stubProvider{
+				getErr:    permanentErr(),
+				deleteErr: provider.Wrap(provider.ErrPermanent, "delete", "stub", "stub-id-1", nil),
+			},
+			wantResult: ctrl.Result{},
+			wantErr:    true,
+			verify: func(t *testing.T, r *ProxyReconciler, _ *stubProvider) {
+				// getProxy fails the test if the object is gone, which is what
+				// finalizer removal would have caused.
+				if p := getProxy(t, r); !slices.Contains(p.Finalizers, crawlv1alpha1.FinalizerName) {
+					t.Error("finalizer removed although cleanup failed; the instance would leak silently")
+				}
+			},
+		},
+		{
+			name:       "skip-cleanup annotation abandons the instance",
+			proxy:      managedProxy(deleting(), withProviderID("stub-id-1"), withSkipCleanup()),
+			stub:       &stubProvider{getInst: &provider.Instance{ID: "stub-id-1", State: provider.StateRunning}},
+			wantResult: ctrl.Result{},
+			verify: func(t *testing.T, r *ProxyReconciler, stub *stubProvider) {
+				assertProxyGone(t, r)
+				if stub.getCalls != 0 || stub.deleteCalls != 0 {
+					t.Errorf("getCalls/deleteCalls = %d/%d, want 0/0 — the provider must not be asked", stub.getCalls, stub.deleteCalls)
+				}
+			},
+		},
+		{
+			name: "skip-cleanup annotation releases a proxy whose provider is gone",
+			proxy: managedProxy(deleting(), withProviderID("stub-id-1"), withSkipCleanup(),
+				func(p *crawlv1alpha1.Proxy) { p.Spec.Provider = "retired" }),
+			stub:       &stubProvider{},
+			wantResult: ctrl.Result{},
+			verify: func(t *testing.T, r *ProxyReconciler, _ *stubProvider) {
+				assertProxyGone(t, r)
+			},
+		},
 		{
 			name:  "deletion deletes the instance and polls",
 			proxy: managedProxy(deleting(), withProviderID("stub-id-1")),