test(crash): pin the side-effect imports every census registers through

Deleting any of the four imports in store/index.ts, or the terminalScrollback
registration, was fully green — including against the whole renderer suite. A
census that never registers turns a missing key from "the instrument never ran"
into a silent absence, which is the one thing the profile promises it is not.

src/renderer/src/store/renderer-memory-profile-registration.test.ts

@@ -0,0 +1,48 @@
+/**
+ * Pins the side-effect imports in store/index.ts that make every census register on
+ * store load. Without them a census registers only when its owning subsystem happens
+ * to load, and a missing key in an OOM report stops meaning "the instrument never
+ * ran" — the contract the whole profile is read against. Deleting any of those
+ * imports is otherwise green.
+ */
+import { describe, expect, it } from 'vitest'
+import './index'
+import { collectRendererMemoryProfileCounts } from '../lib/renderer-memory-profile'
+
+describe('renderer memory profile registration', () => {
+  it('registers every census on store load, zeroed rather than absent', () => {
+    const counts = collectRendererMemoryProfileCounts()
+
+    expect(counts).toMatchObject({
+      'editorContent.panels': 0,
+      'editorContent.files': 0,
+      'editorContent.chars': 0,
+      'editorContent.diffTabs': 0,
+      'editorContent.diffChars': 0,
+      'editorContent.droppedPanels': 0,
+      'terminalOutputBacklog.terminals': 0,
+      'terminalOutputBacklog.chars': 0,
+      'terminalOutputBacklog.maxTerminalChars': 0,
+      'monacoModels.models': 0,
+      'monacoModels.chars': 0,
+      'monacoModels.lines': 0,
+      'liveTerminalBuffers.panes': 0,
+      'liveTerminalBuffers.lines': 0,
+      'liveTerminalBuffers.cells': 0,
+      'liveTerminalBuffers.altScreenPanes': 0,
+      'liveTerminalBuffers.droppedPanes': 0,
+      'terminalScrollback.layouts': 0,
+      'terminalScrollback.buffers': 0,
+      'terminalScrollback.chars': 0,
+      'terminalScrollback.coldRestores': 0,
+      'terminalScrollback.coldRestoreChars': 0
+    })
+    expect(counts).not.toHaveProperty('profile.truncated')
+  })
+
+  it('leaves room in the 64-count budget for the store walk', () => {
+    // Why: contributors are walked in registration order and 'store' registers last,
+    // so an overrun drops the slice sizes rather than the new censuses.
+    expect(Object.keys(collectRendererMemoryProfileCounts()).length).toBeLessThan(64)
+  })
+})