fix: address final review findings for master/agent phase 1 (#6)

- inventory: resolve the image reference via ContainerInspect when a moved
  tag makes ContainerList report the image ID
- store: allow reusing a revoked agent's name (partial unique index) and
  mark the revoked agent's compose/container services removed
- web: publish a services event on revoke; no-store on the one-time token page
- webauth: reject empty OIDC state; accept the CSRF form token from the body only
- agent conn: bound the WebSocket handshake to 30s
- hub: log agent_replaced when a connection replaces an older one

internal/master/store/agents_integration_test.go

@@ -82,3 +82,31 @@ func TestAgents_RecordHelloAndMarkSeen(t *testing.T) {
 	require.NotNil(t, agents[0].LastSeenAt)
 	assert.True(t, agents[0].LastSeenAt.Equal(at.Add(time.Minute)))
 }
+
+func TestAgents_RevokedNameCanBeReused(t *testing.T) {
+	s := openTestStore(t)
+	ctx := context.Background()
+	old, err := s.CreateAgent(ctx, "node-2", "h1")
+	require.NoError(t, err)
+	require.NoError(t, s.RevokeAgent(ctx, old.ID, time.Now()))
+
+	fresh, err := s.CreateAgent(ctx, "node-2", "h2")
+	require.NoError(t, err)
+	assert.NotEqual(t, old.ID, fresh.ID)
+
+	_, err = s.CreateAgent(ctx, "node-2", "h3")
+	assert.ErrorIs(t, err, model.ErrConflict, "a second active agent with the name is still a conflict")
+}
+
+func TestAgents_RevokeRemovesOwnComposeAndContainerServices(t *testing.T) {
+	s := openTestStore(t)
+	ctx := context.Background()
+	id := newAgent(t, s, "swarm-mgr")
+	require.NoError(t, s.ApplySnapshot(ctx, id, manager, []protocol.Service{slusk, adhoc, gitea}, t0))
+
+	require.NoError(t, s.RevokeAgent(ctx, id, t0.Add(time.Hour)))
+
+	got, err := s.ListServices(ctx)
+	require.NoError(t, err)
+	assert.Equal(t, []string{"gitea_gitea"}, names(got), "swarm rows are shared and must survive a revoke")
+}