diff --git a/src/main/crash-reporting/expected-teardown-state.test.ts b/src/main/crash-reporting/expected-teardown-state.test.ts
new file mode 100644
index 000000000..17a296bb5
--- /dev/null
+++ b/src/main/crash-reporting/expected-teardown-state.test.ts
@@ -0,0 +1,193 @@
+import { performance } from 'node:perf_hooks'
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import {
+  shouldRecordProcessGoneCrash,
+  shouldRecoverRendererAfterProcessGone
+} from './process-gone-classification'
+import {
+  markSystemSessionEnding,
+  resetExpectedTeardownStateForTest,
+  resolveExpectedTeardownScope,
+  WINDOWS_SESSION_END_CRASH_SUPPRESSION_WINDOW_MS
+} from './expected-teardown-state'
+
+function shouldRecordKilledRenderer(expectedTeardown: 'none' | 'renderer-reload' | 'app-shutdown') {
+  return shouldRecordProcessGoneCrash({
+    source: 'renderer',
+    processType: 'renderer',
+    reason: 'killed',
+    exitCode: 1,
+    expectedTeardown
+  })
+}
+
+let now: number
+
+beforeEach(() => {
+  now = 1_000
+  resetExpectedTeardownStateForTest(() => now)
+})
+
+afterEach(() => {
+  vi.restoreAllMocks()
+  resetExpectedTeardownStateForTest()
+})
+
+describe('expected teardown state', () => {
+  it('uses a product-chosen five-second harm bound, not a Windows lifetime guarantee', () => {
+    // Restart Manager may wait 30s; tree-kills after this bound remain reportable by design.
+    expect(WINDOWS_SESSION_END_CRASH_SUPPRESSION_WINDOW_MS).toBe(5_000)
+  })
+
+  it('uses the production monotonic clock by default', () => {
+    vi.spyOn(performance, 'now').mockReturnValueOnce(1_000).mockReturnValue(1_001)
+    vi.spyOn(Date, 'now').mockReturnValueOnce(10_000).mockReturnValue(15_000)
+    resetExpectedTeardownStateForTest()
+
+    markSystemSessionEnding()
+
+    expect(
+      resolveExpectedTeardownScope({
+        isQuitting: false,
+        isQuittingForUpdate: false,
+        isExpectedRendererReload: false
+      })
+    ).toBe('app-shutdown')
+  })
+
+  it('does not resurrect session-end after an injected clock rollback and catch-up', () => {
+    now = 3_600_000
+    markSystemSessionEnding()
+    now = 0
+    const rollbackScope = resolveExpectedTeardownScope({
+      isQuitting: false,
+      isQuittingForUpdate: false,
+      isExpectedRendererReload: false
+    })
+    now = 3_600_001
+    const catchUpScope = resolveExpectedTeardownScope({
+      isQuitting: false,
+      isQuittingForUpdate: false,
+      isExpectedRendererReload: false
+    })
+
+    expect(rollbackScope).toBe('none')
+    expect(catchUpScope).toBe('none')
+  })
+
+  it('does not resurrect session-end after expiry and an injected backtrack', () => {
+    markSystemSessionEnding()
+    now += WINDOWS_SESSION_END_CRASH_SUPPRESSION_WINDOW_MS
+    const expiredScope = resolveExpectedTeardownScope({
+      isQuitting: false,
+      isQuittingForUpdate: false,
+      isExpectedRendererReload: false
+    })
+    now -= 1
+    const backtrackScope = resolveExpectedTeardownScope({
+      isQuitting: false,
+      isQuittingForUpdate: false,
+      isExpectedRendererReload: false
+    })
+
+    expect(expiredScope).toBe('none')
+    expect(backtrackScope).toBe('none')
+  })
+
+  it('re-arms the suppression window on repeated session-end events', () => {
+    markSystemSessionEnding()
+    now += WINDOWS_SESSION_END_CRASH_SUPPRESSION_WINDOW_MS - 1
+    markSystemSessionEnding()
+    now += WINDOWS_SESSION_END_CRASH_SUPPRESSION_WINDOW_MS - 1
+
+    expect(
+      resolveExpectedTeardownScope({
+        isQuitting: false,
+        isQuittingForUpdate: false,
+        isExpectedRendererReload: false
+      })
+    ).toBe('app-shutdown')
+  })
+
+  it('classifies killed/1 just inside the session-end window as app shutdown', () => {
+    markSystemSessionEnding()
+    now += WINDOWS_SESSION_END_CRASH_SUPPRESSION_WINDOW_MS - 1
+    const scope = resolveExpectedTeardownScope({
+      isQuitting: false,
+      isQuittingForUpdate: false,
+      isExpectedRendererReload: false
+    })
+
+    expect(scope).toBe('app-shutdown')
+    expect(shouldRecordKilledRenderer(scope)).toBe(false)
+  })
+
+  it('keeps killed/1 reportable at and just outside the session-end boundary', () => {
+    markSystemSessionEnding()
+    now += WINDOWS_SESSION_END_CRASH_SUPPRESSION_WINDOW_MS
+    const boundaryScope = resolveExpectedTeardownScope({
+      isQuitting: false,
+      isQuittingForUpdate: false,
+      isExpectedRendererReload: false
+    })
+    now += 1
+    const outsideScope = resolveExpectedTeardownScope({
+      isQuitting: false,
+      isQuittingForUpdate: false,
+      isExpectedRendererReload: false
+    })
+
+    expect(boundaryScope).toBe('none')
+    expect(outsideScope).toBe('none')
+    expect(shouldRecordKilledRenderer(outsideScope)).toBe(true)
+  })
+
+  it('excludes session-end from recovery while preserving in-app quit suppression', () => {
+    markSystemSessionEnding()
+    const sessionEndScope = resolveExpectedTeardownScope({
+      isQuitting: false,
+      isQuittingForUpdate: false,
+      isExpectedRendererReload: false,
+      includeSystemSessionEnd: false
+    })
+    const inAppQuitScope = resolveExpectedTeardownScope({
+      isQuitting: true,
+      isQuittingForUpdate: false,
+      isExpectedRendererReload: false,
+      includeSystemSessionEnd: false
+    })
+
+    expect(sessionEndScope).toBe('none')
+    expect(
+      shouldRecoverRendererAfterProcessGone({
+        reason: 'killed',
+        expectedTeardown: sessionEndScope
+      })
+    ).toBe(true)
+    expect(inAppQuitScope).toBe('app-shutdown')
+    expect(
+      shouldRecoverRendererAfterProcessGone({
+        reason: 'killed',
+        expectedTeardown: inAppQuitScope
+      })
+    ).toBe(false)
+  })
+
+  it('preserves existing update and renderer-reload scopes', () => {
+    expect(
+      resolveExpectedTeardownScope({
+        isQuitting: false,
+        isQuittingForUpdate: true,
+        isExpectedRendererReload: false
+      })
+    ).toBe('app-shutdown')
+    expect(
+      resolveExpectedTeardownScope({
+        isQuitting: false,
+        isQuittingForUpdate: false,
+        isExpectedRendererReload: true,
+        includeSystemSessionEnd: false
+      })
+    ).toBe('renderer-reload')
+  })
+})
diff --git a/src/main/crash-reporting/expected-teardown-state.ts b/src/main/crash-reporting/expected-teardown-state.ts
new file mode 100644
index 000000000..1480ecbbf
--- /dev/null
+++ b/src/main/crash-reporting/expected-teardown-state.ts
@@ -0,0 +1,58 @@
+import { performance } from 'node:perf_hooks'
+import type { ExpectedTeardownScope } from './process-gone-classification'
+
+// Why: 5s bounds harm; Restart Manager may wait 30s, so later kills remain reportable.
+export const WINDOWS_SESSION_END_CRASH_SUPPRESSION_WINDOW_MS = 5_000
+
+type Clock = () => number
+
+// Windows performance.now is monotonic and includes time spent suspended.
+const monotonicNow = (): number => performance.now()
+let now: Clock = monotonicNow
+let systemSessionEndedAt: number | null = null
+
+export function markSystemSessionEnding(): void {
+  systemSessionEndedAt = now()
+}
+
+function isRecentSystemSessionEnd(): boolean {
+  if (systemSessionEndedAt === null) {
+    return false
+  }
+  const elapsed = now() - systemSessionEndedAt
+  if (elapsed < 0) {
+    systemSessionEndedAt = null
+    return false
+  }
+  if (elapsed >= WINDOWS_SESSION_END_CRASH_SUPPRESSION_WINDOW_MS) {
+    systemSessionEndedAt = null
+    return false
+  }
+  return true
+}
+
+export function resolveExpectedTeardownScope({
+  isQuitting,
+  isQuittingForUpdate,
+  isExpectedRendererReload,
+  includeSystemSessionEnd = true
+}: {
+  isQuitting: boolean
+  isQuittingForUpdate: boolean
+  isExpectedRendererReload: boolean
+  includeSystemSessionEnd?: boolean
+}): ExpectedTeardownScope {
+  if (
+    isQuitting ||
+    isQuittingForUpdate ||
+    (includeSystemSessionEnd && isRecentSystemSessionEnd())
+  ) {
+    return 'app-shutdown'
+  }
+  return isExpectedRendererReload ? 'renderer-reload' : 'none'
+}
+
+export function resetExpectedTeardownStateForTest(clock: Clock = monotonicNow): void {
+  now = clock
+  systemSessionEndedAt = null
+}
diff --git a/src/main/crash-reporting/process-gone-killed-one-ordering.test.ts b/src/main/crash-reporting/process-gone-killed-one-ordering.test.ts
new file mode 100644
index 000000000..7f47e7942
--- /dev/null
+++ b/src/main/crash-reporting/process-gone-killed-one-ordering.test.ts
@@ -0,0 +1,149 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+
+vi.mock('electron', () => ({
+  app: {
+    getVersion: () => '1.2.3-test',
+    getAppMetrics: () => []
+  }
+}))
+
+import { clearCrashBreadcrumbsForTest } from './crash-breadcrumb-store'
+import {
+  markSystemSessionEnding,
+  resetExpectedTeardownStateForTest,
+  resolveExpectedTeardownScope,
+  WINDOWS_SESSION_END_CRASH_SUPPRESSION_WINDOW_MS
+} from './expected-teardown-state'
+import { ProcessGoneDedupe } from './process-gone-dedupe'
+import { recordProcessGoneCrash, type ProcessGoneCrashEvent } from './process-gone-recorder'
+
+function event(overrides: Partial<ProcessGoneCrashEvent> = {}): ProcessGoneCrashEvent {
+  return {
+    source: 'renderer',
+    processType: 'renderer',
+    reason: 'killed',
+    exitCode: 1,
+    expectedTeardown: 'none',
+    details: { processType: 'renderer' },
+    ...overrides
+  }
+}
+
+const gpuKill = event({
+  source: 'child',
+  processType: 'GPU',
+  details: { serviceName: 'GPU', type: 'GPU' }
+})
+const networkServiceKill = event({
+  source: 'child',
+  processType: 'Utility',
+  details: {
+    name: 'Network Service',
+    serviceName: 'network.mojom.NetworkService',
+    type: 'Utility'
+  }
+})
+const rendererKill = event()
+
+function currentTeardownScope() {
+  return resolveExpectedTeardownScope({
+    isQuitting: false,
+    isQuittingForUpdate: false,
+    isExpectedRendererReload: false
+  })
+}
+
+let now: number
+
+beforeEach(() => {
+  now = 1_000
+  resetExpectedTeardownStateForTest(() => now)
+  clearCrashBreadcrumbsForTest()
+})
+
+afterEach(() => {
+  vi.restoreAllMocks()
+  resetExpectedTeardownStateForTest()
+  clearCrashBreadcrumbsForTest()
+})
+
+describe('recordProcessGoneCrash killed/1 ordering', () => {
+  it('reports a genuine lone renderer killed/1 without teardown intent', () => {
+    const record = vi.fn().mockResolvedValue({ id: 'report-1' })
+
+    recordProcessGoneCrash({ record } as never, rendererKill, new ProcessGoneDedupe())
+
+    expect(record).toHaveBeenCalledOnce()
+  })
+
+  it('reports R3 after matching recoverable sibling churn', () => {
+    const record = vi.fn().mockResolvedValue({ id: 'report-1' })
+    const dedupe = new ProcessGoneDedupe()
+
+    recordProcessGoneCrash({ record } as never, gpuKill, dedupe)
+    recordProcessGoneCrash({ record } as never, networkServiceKill, dedupe)
+    recordProcessGoneCrash({ record } as never, rendererKill, dedupe)
+
+    expect(record).toHaveBeenCalledOnce()
+  })
+
+  it('suppresses the fleet sequence only after independent session-end intent', () => {
+    const record = vi.fn().mockResolvedValue({ id: 'report-1' })
+    const dedupe = new ProcessGoneDedupe()
+    markSystemSessionEnding()
+    const expectedTeardown = currentTeardownScope()
+
+    recordProcessGoneCrash({ record } as never, event({ ...gpuKill, expectedTeardown }), dedupe)
+    recordProcessGoneCrash(
+      { record } as never,
+      event({ ...networkServiceKill, expectedTeardown }),
+      dedupe
+    )
+    recordProcessGoneCrash(
+      { record } as never,
+      event({ ...rendererKill, expectedTeardown }),
+      dedupe
+    )
+
+    expect(expectedTeardown).toBe('app-shutdown')
+    expect(record).not.toHaveBeenCalled()
+  })
+
+  it('durably reports killed/1 after the session-end window expires', () => {
+    const record = vi.fn().mockResolvedValue({ id: 'report-1' })
+    markSystemSessionEnding()
+    now += WINDOWS_SESSION_END_CRASH_SUPPRESSION_WINDOW_MS
+    const expectedTeardown = currentTeardownScope()
+
+    recordProcessGoneCrash(
+      { record } as never,
+      event({ ...rendererKill, expectedTeardown }),
+      new ProcessGoneDedupe()
+    )
+
+    expect(expectedTeardown).toBe('none')
+    expect(record).toHaveBeenCalledOnce()
+  })
+
+  it('keeps a renderer report filed when session-end intent arrives later', () => {
+    const record = vi.fn().mockResolvedValue({ id: 'report-1' })
+    const scopeBeforeSessionEnd = currentTeardownScope()
+
+    recordProcessGoneCrash(
+      { record } as never,
+      event({ ...rendererKill, expectedTeardown: scopeBeforeSessionEnd }),
+      new ProcessGoneDedupe()
+    )
+    markSystemSessionEnding()
+    const scopeAfterSessionEnd = currentTeardownScope()
+    recordProcessGoneCrash(
+      { record } as never,
+      event({ ...rendererKill, expectedTeardown: scopeAfterSessionEnd }),
+      new ProcessGoneDedupe()
+    )
+
+    expect(scopeBeforeSessionEnd).toBe('none')
+    expect(scopeAfterSessionEnd).toBe('app-shutdown')
+    expect(record).toHaveBeenCalledOnce()
+  })
+})
diff --git a/src/main/index.ts b/src/main/index.ts
index 912941275..e5a0050a7 100644
--- a/src/main/index.ts
+++ b/src/main/index.ts
@@ -298,6 +298,7 @@ import {
   type ExpectedTeardownScope
 } from './crash-reporting/process-gone-classification'
 import { recordProcessGoneCrash as recordProcessGoneCrashEvent } from './crash-reporting/process-gone-recorder'
+import { resolveExpectedTeardownScope } from './crash-reporting/expected-teardown-state'
 import {
   advanceSyntheticTitleSpinnerEntries,
   type SyntheticTitleSpinnerEntry
@@ -697,14 +698,17 @@ function clearExpectedRendererReload(webContentsId?: number): void {
   expectedRendererReload.clear(webContentsId)
 }
 
-function getExpectedTeardownScope(webContentsId?: number): ExpectedTeardownScope {
-  if (isQuitting || isQuittingForUpdate()) {
-    return 'app-shutdown'
-  }
-  if (webContentsId === undefined) {
-    return 'none'
-  }
-  return expectedRendererReload.matches(webContentsId) ? 'renderer-reload' : 'none'
+function getExpectedTeardownScope(
+  webContentsId?: number,
+  includeSystemSessionEnd = true
+): ExpectedTeardownScope {
+  return resolveExpectedTeardownScope({
+    isQuitting,
+    isQuittingForUpdate: isQuittingForUpdate(),
+    isExpectedRendererReload:
+      webContentsId !== undefined && expectedRendererReload.matches(webContentsId),
+    includeSystemSessionEnd
+  })
 }
 
 function markRecoveryReloadInFlight(webContentsId: number, durationMs = 10_000): void {
@@ -1263,7 +1267,7 @@ function openMainWindow(): BrowserWindow {
     shouldRecoverRenderer: (details, webContentsId) =>
       shouldRecoverRendererAfterProcessGone({
         reason: details.reason,
-        expectedTeardown: getExpectedTeardownScope(webContentsId)
+        expectedTeardown: getExpectedTeardownScope(webContentsId, false)
       }),
     onRendererRecoveryExhausted: ({ details, recentRecoveryCount }) => {
       recordDurableCrashBreadcrumb('renderer_recovery_circuit_breaker_open', {
diff --git a/src/main/startup/desktop-startup-ordering.test.ts b/src/main/startup/desktop-startup-ordering.test.ts
index 7dc276219..001bc5252 100644
--- a/src/main/startup/desktop-startup-ordering.test.ts
+++ b/src/main/startup/desktop-startup-ordering.test.ts
@@ -156,6 +156,33 @@ describe('startup ordering', () => {
     expect(startIndex).toBeGreaterThan(attachIndex)
   })
 
+  it('wires bounded teardown state to reporting but not recovery or close behavior', () => {
+    const source = readFileSync(join(process.cwd(), 'src/main/index.ts'), 'utf8')
+    const scopeStart = source.indexOf('function getExpectedTeardownScope(')
+    const scopeEnd = source.indexOf('function markRecoveryReloadInFlight(', scopeStart)
+    const scope = source.slice(scopeStart, scopeEnd)
+    const windowStart = source.indexOf('const window = createMainWindow(store, {')
+    const windowEnd = source.indexOf('onRendererRecoveryExhausted:', windowStart)
+    const windowOptions = source.slice(windowStart, windowEnd)
+    const recorderStart = source.indexOf('function recordProcessGoneCrash(')
+    const recorderEnd = source.indexOf('function shutdownWatchersOnce(', recorderStart)
+    const recorder = source.slice(recorderStart, recorderEnd)
+
+    expect(scopeStart).toBeGreaterThanOrEqual(0)
+    expect(scopeEnd).toBeGreaterThan(scopeStart)
+    expect(scope).toContain('resolveExpectedTeardownScope({')
+    expect(scope).toContain('includeSystemSessionEnd')
+    expect(windowStart).toBeGreaterThanOrEqual(0)
+    expect(windowEnd).toBeGreaterThan(windowStart)
+    expect(windowOptions).toContain('getIsQuitting: () => isQuitting')
+    expect(windowOptions).toContain(
+      'expectedTeardown: getExpectedTeardownScope(webContentsId, false)'
+    )
+    expect(recorderStart).toBeGreaterThanOrEqual(0)
+    expect(recorderEnd).toBeGreaterThan(recorderStart)
+    expect(recorder).toContain('expectedTeardown: getExpectedTeardownScope(webContentsId)')
+  })
+
   it('attaches renderer services before starting the TCC prompt watcher', () => {
     const source = readFileSync(join(process.cwd(), 'src/main/index.ts'), 'utf8')
     const attachIndex = source.indexOf('attachMainWindowServices(')
diff --git a/src/main/window/createMainWindow.test.ts b/src/main/window/createMainWindow.test.ts
index bc595f10b..bbff3b994 100644
--- a/src/main/window/createMainWindow.test.ts
+++ b/src/main/window/createMainWindow.test.ts
@@ -74,6 +74,11 @@ import {
 } from './createMainWindow'
 import { ipcMain } from 'electron'
 import { shouldRecoverRendererAfterProcessGone } from '../crash-reporting/process-gone-classification'
+import {
+  resetExpectedTeardownStateForTest,
+  resolveExpectedTeardownScope,
+  WINDOWS_SESSION_END_CRASH_SUPPRESSION_WINDOW_MS
+} from '../crash-reporting/expected-teardown-state'
 
 function withPlatform<T>(platform: NodeJS.Platform, run: () => T): T {
   const original = process.platform
@@ -102,6 +107,7 @@ describe('createMainWindow', () => {
     vi.mocked(ipcMain.removeListener).mockReset()
     vi.mocked(ipcMain.handle).mockReset()
     vi.mocked(ipcMain.removeHandler).mockReset()
+    resetExpectedTeardownStateForTest()
     vi.useRealTimers()
   })
 
@@ -3143,6 +3149,40 @@ describe('createMainWindow', () => {
     consoleError.mockRestore()
   })
 
+  it('still preserves PTYs and reloads after Windows session-end', () => {
+    vi.useFakeTimers()
+
+    const consoleError = vi.spyOn(console, 'error').mockImplementation(() => {})
+    const { browserWindowInstance, windowHandlers } = createRendererRecoveryWindowHarness()
+    const onBeforeRecoveryReload = vi.fn()
+
+    withPlatform('win32', () => {
+      createMainWindow(null, {
+        onBeforeRecoveryReload,
+        shouldRecoverRenderer: (details) =>
+          shouldRecoverRendererAfterProcessGone({
+            reason: details.reason,
+            expectedTeardown: resolveExpectedTeardownScope({
+              isQuitting: false,
+              isQuittingForUpdate: false,
+              isExpectedRendererReload: false,
+              includeSystemSessionEnd: false
+            })
+          })
+      })
+    })
+    windowHandlers['session-end']?.({} as never)
+    windowHandlers['render-process-gone']?.(
+      {} as never,
+      { reason: 'killed', exitCode: 1 } as Electron.RenderProcessGoneDetails
+    )
+    vi.runAllTimers()
+
+    expect(onBeforeRecoveryReload).toHaveBeenCalledWith(143)
+    expect(browserWindowInstance.loadFile).toHaveBeenCalledTimes(2)
+    consoleError.mockRestore()
+  })
+
   it('does not reload after renderer loss when recovery is disabled', () => {
     vi.useFakeTimers()
 
@@ -3730,6 +3770,60 @@ describe('createMainWindow', () => {
       setPlatform(originalPlatform)
     })
 
+    it('marks production teardown state on irrevocable Windows session end', () => {
+      setPlatform('win32')
+      resetExpectedTeardownStateForTest(() => 1_000)
+      const { windowHandlers } = setupCloseWindow()
+
+      createMainWindow(null)
+      windowHandlers['session-end']?.({} as never)
+
+      expect(
+        resolveExpectedTeardownScope({
+          isQuitting: false,
+          isQuittingForUpdate: false,
+          isExpectedRendererReload: false
+        })
+      ).toBe('app-shutdown')
+    })
+
+    it.each(['darwin', 'linux'] as const)(
+      'does not mark session teardown state on %s',
+      (platform) => {
+        setPlatform(platform)
+        const { windowHandlers } = setupCloseWindow()
+
+        createMainWindow(null)
+
+        expect(windowHandlers['session-end']).toBeUndefined()
+        expect(
+          resolveExpectedTeardownScope({
+            isQuitting: false,
+            isQuittingForUpdate: false,
+            isExpectedRendererReload: false
+          })
+        ).toBe('none')
+      }
+    )
+
+    it('still minimizes to tray after the session-end reporting window expires', () => {
+      setPlatform('win32')
+      let now = 1_000
+      resetExpectedTeardownStateForTest(() => now)
+      const { windowHandlers, webContents, instance } = setupCloseWindow()
+      const store = makeStore(true, true)
+
+      createMainWindow(store as never)
+      windowHandlers['session-end']?.({} as never)
+      now += WINDOWS_SESSION_END_CRASH_SUPPRESSION_WINDOW_MS
+      const preventDefault = vi.fn()
+      windowHandlers.close({ preventDefault } as never)
+
+      expect(preventDefault).toHaveBeenCalledOnce()
+      expect(instance.hide).toHaveBeenCalledOnce()
+      expect(webContents.send).not.toHaveBeenCalledWith('window:close-requested', expect.anything())
+    })
+
     it('hides to the tray instead of closing when the setting is on', () => {
       setPlatform('win32')
       const { windowHandlers, webContents, instance } = setupCloseWindow()
diff --git a/src/main/window/createMainWindow.ts b/src/main/window/createMainWindow.ts
index 327772164..f04cfb724 100644
--- a/src/main/window/createMainWindow.ts
+++ b/src/main/window/createMainWindow.ts
@@ -19,6 +19,7 @@ import { translateMain } from '../i18n/main-i18n'
 import { normalizeBrowserNavigationUrl } from '../../shared/browser-url'
 import { ORCA_BROWSER_GUEST_WEB_PREFERENCES } from '../../shared/browser-guest-web-preferences'
 import { isCrashReportReason } from '../../shared/crash-reporting'
+import { markSystemSessionEnding } from '../crash-reporting/expected-teardown-state'
 import {
   DEFAULT_RENDERER_RECOVERY_MAX_RECOVERIES,
   DEFAULT_RENDERER_RECOVERY_WINDOW_MS,
@@ -304,6 +305,11 @@ export function createMainWindow(
   // Why: native paste fallback is privileged IPC; only the top-level renderer may request it.
   setTrustedUIRendererWebContentsId(rendererWebContentsId)
 
+  // Unlike query-session-end, session-end cannot be canceled before this signal is recorded.
+  if (process.platform === 'win32') {
+    mainWindow.on('session-end', markSystemSessionEnding)
+  }
+
   if (process.platform === 'darwin') {
     // Why: preserve hidden-window power savings; stable native sizing and frame-only invalidation
     // make wake recovery independent of the throttled viewport.