chore: import upstream snapshot with attribution

apps/sim/blocks/visibility/registry-inert.test.ts

@@ -0,0 +1,60 @@
+/**
+ * @vitest-environment node
+ */
+import { afterEach, describe, expect, it, vi } from 'vitest'
+
+vi.unmock('@/blocks/registry')
+
+const { synthRegistry } = vi.hoisted(() => ({
+  synthRegistry: {
+    slack: {
+      type: 'slack',
+      name: 'Slack',
+      description: '',
+      category: 'tools',
+      bgColor: '#000',
+      icon: () => null,
+      subBlocks: [],
+      tools: { access: [] },
+      inputs: {},
+      outputs: {},
+    },
+  },
+}))
+
+vi.mock('@/blocks/registry-maps', () => ({
+  BLOCK_REGISTRY: synthRegistry,
+  BLOCK_META_REGISTRY: {},
+}))
+
+import { getAllBlocks } from '@/blocks/registry'
+import { registerBlockVisibilityResolver } from '@/blocks/visibility/context'
+
+afterEach(() => registerBlockVisibilityResolver(null))
+
+describe('registry fast path (no preview blocks registered)', () => {
+  it('returns raw references with no context', () => {
+    expect(getAllBlocks()[0]).toBe(synthRegistry.slack)
+  })
+
+  it('returns raw references when the active state has no kill-switch entries', () => {
+    const state = {
+      revealed: new Set(['whatever']),
+      disabled: new Set<string>(),
+      previewTagged: new Set(['whatever']),
+    }
+    registerBlockVisibilityResolver({ current: () => state })
+    expect(getAllBlocks()[0]).toBe(synthRegistry.slack)
+  })
+
+  it('still projects when a kill-switch entry applies', () => {
+    const state = {
+      revealed: new Set<string>(),
+      disabled: new Set(['slack']),
+      previewTagged: new Set<string>(),
+    }
+    registerBlockVisibilityResolver({ current: () => state })
+    expect(getAllBlocks()[0]?.hideFromToolbar).toBe(true)
+    expect(synthRegistry.slack).not.toHaveProperty('hideFromToolbar', true)
+  })
+})