diff --git a/config/focus-setting-read-baseline.txt b/config/focus-setting-read-baseline.txt
index 43d59d877fd..3e9ef1c81e2 100644
--- a/config/focus-setting-read-baseline.txt
+++ b/config/focus-setting-read-baseline.txt
@@ -421,7 +421,6 @@
 1 src/renderer/src/store/slices/editor/actions/open-file-action.ts
 1 src/renderer/src/store/slices/editor/actions/open-file-apply.ts
 1 src/renderer/src/store/slices/editor/create-editor-slice.ts
-1 src/renderer/src/store/slices/github-cache-key.ts
 1 src/renderer/src/store/slices/hosted-review-cache-identity.ts
 5 src/renderer/src/store/slices/jira-collection-read-actions.ts
 31 src/renderer/src/store/slices/jira-connection-actions.ts
diff --git a/src/main/runtime/orca-runtime.ts b/src/main/runtime/orca-runtime.ts
index e507d04e9ae..27ec067ef84 100644
--- a/src/main/runtime/orca-runtime.ts
+++ b/src/main/runtime/orca-runtime.ts
@@ -1,7 +1,7 @@
 import type { RuntimeLinearCommandSurface } from './runtime-linear-command-surface'
 import { installRuntimeLinearCommandSurface } from './runtime-linear-command-surface'
 import { publishWorkspaceViewChanges } from './runtime-workspace-view-change-events'
-import { OrcaRuntimeWithWorkspaceActivityFacts } from './sidebar-inputs/orca-runtime-workspace-activity-facts'
+import { OrcaRuntimeWithWorkspaceReviewFacts } from './sidebar-inputs/orca-runtime-workspace-review-facts'
 import type { RuntimeCommandSurfaceHost } from './orca-runtime-core'
 import type {
   AgentLaunchTabPublished,
@@ -36,7 +36,7 @@ import { HEADLESS_RUNTIME_WINDOW_ID } from '../../shared/runtime-session-contrac
 import { getHostDisplayLabelOverrides } from '../../shared/host-setting-overrides'
 
 // oxlint-disable-next-line typescript/no-unsafe-declaration-merging -- SAFETY: The existing Linear installer supplies the canonical prototype surface.
-class OrcaRuntimeService extends OrcaRuntimeWithWorkspaceActivityFacts {
+class OrcaRuntimeService extends OrcaRuntimeWithWorkspaceReviewFacts {
   // Idle until relay hosts attach. The fallback refresh runs while a window shows the sidebar.
   readonly pairedServerRows = new PairedServerRowsProducer({
     hasDemand: () =>
@@ -99,7 +99,7 @@ class OrcaRuntimeService extends OrcaRuntimeWithWorkspaceActivityFacts {
     })
   }
 
-  constructor(...args: ConstructorParameters<typeof OrcaRuntimeWithWorkspaceActivityFacts>) {
+  constructor(...args: ConstructorParameters<typeof OrcaRuntimeWithWorkspaceReviewFacts>) {
     super(...args)
     // Why: the runtime listing re-runs a scan the worktree-change generation overtook and re-lists
     // through this runtime's scan cache, so a worktree change must reach both. The desktop IPC
diff --git a/src/main/runtime/rpc/methods/sidebar-inputs.ts b/src/main/runtime/rpc/methods/sidebar-inputs.ts
index 1a5cbb7fdff..b4b20627d66 100644
--- a/src/main/runtime/rpc/methods/sidebar-inputs.ts
+++ b/src/main/runtime/rpc/methods/sidebar-inputs.ts
@@ -27,5 +27,11 @@ export const SIDEBAR_INPUT_METHODS = [
     permission: 'workspace',
     params: null,
     handler: async (_params, { runtime }) => runtime.pairedServerRows.snapshot()
+  }),
+  defineMethod({
+    name: 'sidebarInputs.reviewFacts',
+    permission: 'workspace',
+    params: null,
+    handler: async (_params, { runtime }) => runtime.getWorkspaceReviewFacts()
   })
 ]
diff --git a/src/main/runtime/sidebar-inputs/orca-runtime-workspace-review-facts.test.ts b/src/main/runtime/sidebar-inputs/orca-runtime-workspace-review-facts.test.ts
new file mode 100644
index 00000000000..5aed0303b49
--- /dev/null
+++ b/src/main/runtime/sidebar-inputs/orca-runtime-workspace-review-facts.test.ts
@@ -0,0 +1,75 @@
+// Runs on plain Node, as orcad does: facts come from the host's persisted PR cache.
+import { describe, expect, it } from 'vitest'
+import { OrcaRuntimeService } from '../orca-runtime'
+import type { PRInfo } from '../../../shared/github/pull-request-types'
+import type { RuntimeStore } from '../runtime-store-contract'
+import type { ResolvedWorktreeSnapshot } from '../runtime-resolved-worktree-cache'
+import type { ResolvedWorktree } from '../runtime-worktree-path-identity'
+
+const repo = { id: 'repo-1', path: '/r', displayName: 'r', badgeColor: 'blue', addedAt: 1 }
+
+function worktree(id: string, branch: string): ResolvedWorktree {
+  return {
+    id,
+    repoId: repo.id,
+    path: id,
+    branch,
+    head: '',
+    isBare: false,
+    isMainWorktree: false,
+    displayName: id,
+    comment: '',
+    linkedIssue: null,
+    linkedPR: null,
+    linkedLinearIssue: null,
+    linkedGitLabMR: null,
+    linkedGitLabIssue: null,
+    isArchived: false,
+    isUnread: false,
+    isPinned: false,
+    sortOrder: 0,
+    lastActivityAt: 0,
+    parentWorktreeId: null,
+    childWorktreeIds: [],
+    lineage: null,
+    git: { path: id, head: '', branch, isBare: false, isMainWorktree: false }
+  }
+}
+
+describe('getWorkspaceReviewFacts', () => {
+  it('keys the persisted PR cache by workspace', async () => {
+    const merged: PRInfo = {
+      number: 3,
+      title: 'Ship it',
+      state: 'merged',
+      url: 'https://github.com/o/r/pull/3',
+      checksStatus: 'success',
+      updatedAt: '2026-10-17T00:00:00Z',
+      mergeable: 'UNKNOWN'
+    }
+    const pr = { 'repo-1::a': { data: merged, fetchedAt: 1 } }
+    const store: Pick<RuntimeStore, 'getRepos' | 'getGitHubCache'> = {
+      getRepos: () => [repo],
+      getGitHubCache: () => ({ pr, issue: {} })
+    }
+    class Probe extends OrcaRuntimeService {
+      protected override async listResolvedWorktreeSnapshot(): Promise<ResolvedWorktreeSnapshot> {
+        return {
+          worktrees: [worktree('repo-1::/r/a', 'refs/heads/a'), worktree('repo-1::/r/b', 'b')],
+          platformByRepoId: new Map()
+        }
+      }
+    }
+    // oxlint-disable-next-line typescript/consistent-type-assertions -- SAFETY: the read touches only repos and the GitHub cache.
+    const runtime = new Probe(store as RuntimeStore)
+    await expect(runtime.getWorkspaceReviewFacts()).resolves.toEqual({
+      facts: { 'repo-1::/r/a': { provider: 'github', reviewState: 'merged' } }
+    })
+  })
+
+  it('publishes nothing without a store', async () => {
+    await expect(new OrcaRuntimeService().getWorkspaceReviewFacts()).resolves.toEqual({
+      facts: {}
+    })
+  })
+})
diff --git a/src/main/runtime/sidebar-inputs/orca-runtime-workspace-review-facts.ts b/src/main/runtime/sidebar-inputs/orca-runtime-workspace-review-facts.ts
new file mode 100644
index 00000000000..785fe924565
--- /dev/null
+++ b/src/main/runtime/sidebar-inputs/orca-runtime-workspace-review-facts.ts
@@ -0,0 +1,26 @@
+import { OrcaRuntimeWithWorkspaceActivityFacts } from './orca-runtime-workspace-activity-facts'
+import {
+  buildWorkspaceReviewFacts,
+  type WorkspaceReviewFactsSnapshot
+} from '../../../shared/sidebar-list/workspace-review-facts'
+
+/**
+ * PR facts per workspace, read on demand from this host's copy of the PR cache. The window
+ * persists its cache here within a second of any change; orcad has no window, so it reads only
+ * what its profile already holds.
+ */
+export abstract class OrcaRuntimeWithWorkspaceReviewFacts extends OrcaRuntimeWithWorkspaceActivityFacts {
+  async getWorkspaceReviewFacts(): Promise<WorkspaceReviewFactsSnapshot> {
+    if (!this.store) {
+      return { facts: {} }
+    }
+    const { worktrees } = await this.listResolvedWorktreeSnapshot()
+    return {
+      facts: buildWorkspaceReviewFacts(
+        worktrees,
+        this.store.getRepos(),
+        this.store.getGitHubCache().pr
+      )
+    }
+  }
+}
diff --git a/src/renderer/src/components/cmd-j/worktree-checks-review-index.test.ts b/src/renderer/src/components/cmd-j/worktree-checks-review-index.test.ts
index 47d03b253c9..ff5e9b3fe7f 100644
--- a/src/renderer/src/components/cmd-j/worktree-checks-review-index.test.ts
+++ b/src/renderer/src/components/cmd-j/worktree-checks-review-index.test.ts
@@ -3,7 +3,7 @@ import type { HostedReviewInfo } from '../../../../shared/hosted-review'
 import type { PRInfo } from '../../../../shared/github/pull-request-types'
 import type { Repo } from '../../../../shared/repo-types'
 import type { Worktree } from '../../../../shared/worktree/types'
-import { getGitHubPRCacheKey } from '@/store/slices/github-cache-key'
+import { getGitHubPRCacheKey } from '../../../../shared/github/github-cache-key'
 import { getHostedReviewCacheKey } from '@/store/slices/hosted-review-cache-identity'
 import { getRepoHostIdentity } from '@/store/slices/repo-host-identity'
 import { searchWorktrees } from '@/lib/worktree-palette-search'
diff --git a/src/renderer/src/components/cmd-j/worktree-checks-review-index.ts b/src/renderer/src/components/cmd-j/worktree-checks-review-index.ts
index ab35ff74a35..86c98f13562 100644
--- a/src/renderer/src/components/cmd-j/worktree-checks-review-index.ts
+++ b/src/renderer/src/components/cmd-j/worktree-checks-review-index.ts
@@ -1,6 +1,6 @@
 import { resolveWorktreeBranchLabel } from '@/lib/worktree-default-display-name'
 import { resolvePaletteRepoForWorktree } from '@/lib/palette-repo-resolution'
-import { getGitHubPRCacheKey } from '@/store/slices/github-cache-key'
+import { getGitHubPRCacheKey } from '../../../../shared/github/github-cache-key'
 import { getHostedReviewCacheKey } from '@/store/slices/hosted-review-cache-identity'
 import type { AppState } from '@/store/types'
 import type { HostedReviewInfo } from '../../../../shared/hosted-review'
diff --git a/src/renderer/src/components/dashboard/dashboard-card-context.test.ts b/src/renderer/src/components/dashboard/dashboard-card-context.test.ts
index c1de10ae18a..a2b47f53a2c 100644
--- a/src/renderer/src/components/dashboard/dashboard-card-context.test.ts
+++ b/src/renderer/src/components/dashboard/dashboard-card-context.test.ts
@@ -3,7 +3,7 @@ import type { HostedReviewInfo } from '../../../../shared/hosted-review'
 import type { PRInfo } from '../../../../shared/github/pull-request-types'
 import type { Repo } from '../../../../shared/repo-types'
 import type { Worktree } from '../../../../shared/worktree/types'
-import { getGitHubPRCacheKey } from '@/store/slices/github-cache-key'
+import { getGitHubPRCacheKey } from '../../../../shared/github/github-cache-key'
 import { getHostedReviewCacheKey } from '@/store/slices/hosted-review-cache-identity'
 import {
   resolveDashboardCardContext,
diff --git a/src/renderer/src/components/editor/check-run-details-fix-context.ts b/src/renderer/src/components/editor/check-run-details-fix-context.ts
index 8227ac17fd7..64c740c7764 100644
--- a/src/renderer/src/components/editor/check-run-details-fix-context.ts
+++ b/src/renderer/src/components/editor/check-run-details-fix-context.ts
@@ -6,7 +6,7 @@ import {
 import { gitHubPRToChecksPanelReview } from '@/components/right-sidebar/checks-panel-review'
 import { getWorktreeGitIdentityDisplay } from '../../../../shared/worktree/git-identity-display'
 import { useAppStore } from '@/store'
-import { getGitHubPRCacheKey } from '@/store/slices/github-cache-key'
+import { getGitHubPRCacheKey } from '../../../../shared/github/github-cache-key'
 import { getHostedReviewCacheKey } from '@/store/slices/hosted-review-cache-identity'
 import { findWorktreeById } from '@/store/slices/worktree-helpers'
 import type { HostedReviewInfo } from '../../../../shared/hosted-review'
diff --git a/src/renderer/src/components/right-sidebar/FolderWorkspacePrChecksPanel.test.tsx b/src/renderer/src/components/right-sidebar/FolderWorkspacePrChecksPanel.test.tsx
index 9a634120ca0..790fc33227c 100644
--- a/src/renderer/src/components/right-sidebar/FolderWorkspacePrChecksPanel.test.tsx
+++ b/src/renderer/src/components/right-sidebar/FolderWorkspacePrChecksPanel.test.tsx
@@ -11,7 +11,7 @@ import type { Worktree } from '../../../../shared/worktree/types'
 import type { HostedReviewInfo } from '../../../../shared/hosted-review'
 import { folderWorkspaceKey, worktreeWorkspaceKey } from '../../../../shared/workspace-scope'
 import { getHostedReviewCacheKey } from '@/store/slices/hosted-review-cache-identity'
-import { getGitHubRepoCacheKey } from '@/store/slices/github-cache-key'
+import { getGitHubRepoCacheKey } from '../../../../shared/github/github-cache-key'
 import { prChecksCacheSuffix } from '@/store/github/cache-identity'
 
 type MockStoreState = {
diff --git a/src/renderer/src/components/right-sidebar/active-checks-status.ts b/src/renderer/src/components/right-sidebar/active-checks-status.ts
index 9f1e08a03ba..3365e3a447e 100644
--- a/src/renderer/src/components/right-sidebar/active-checks-status.ts
+++ b/src/renderer/src/components/right-sidebar/active-checks-status.ts
@@ -1,7 +1,7 @@
 import type { AppState } from '../../store/types'
 import { getRepoMapFromState, getWorktreeMapFromState } from '../../store/selectors'
 import type { CheckStatus } from '../../../../shared/github/pull-request-types'
-import { getGitHubPRCacheKey } from '../../store/slices/github-cache-key'
+import { getGitHubPRCacheKey } from '../../../../shared/github/github-cache-key'
 import { getHostedReviewCacheKey } from '../../store/slices/hosted-review-cache-identity'
 import { isGitHubPRSuppressed } from '../../../../shared/worktree/github-pr-suppression'
 
diff --git a/src/renderer/src/components/right-sidebar/checks-panel/use-checks-panel-context-state.tsx b/src/renderer/src/components/right-sidebar/checks-panel/use-checks-panel-context-state.tsx
index dcd7199587a..5ee0f4e891f 100644
--- a/src/renderer/src/components/right-sidebar/checks-panel/use-checks-panel-context-state.tsx
+++ b/src/renderer/src/components/right-sidebar/checks-panel/use-checks-panel-context-state.tsx
@@ -2,7 +2,7 @@ import { useCallback, useEffect, useState } from 'react'
 import { useAppStore } from '@/store'
 import { useNow } from '@/hooks/use-now'
 import { isFolderRepo } from '../../../../../shared/repo-kind'
-import { getGitHubPRCacheKey } from '@/store/slices/github-cache-key'
+import { getGitHubPRCacheKey } from '../../../../../shared/github/github-cache-key'
 import { getHostedReviewCacheKey } from '@/store/slices/hosted-review-cache-identity'
 import { selectReviewCacheEntry } from '../review-cache-entry-selection'
 import { selectChecksPanelReview, type ChecksPanelReview } from '../checks-panel-review'
diff --git a/src/renderer/src/components/right-sidebar/checks-panel/use-checks-panel-review-state.tsx b/src/renderer/src/components/right-sidebar/checks-panel/use-checks-panel-review-state.tsx
index 9b6c147724e..902603bab55 100644
--- a/src/renderer/src/components/right-sidebar/checks-panel/use-checks-panel-review-state.tsx
+++ b/src/renderer/src/components/right-sidebar/checks-panel/use-checks-panel-review-state.tsx
@@ -1,7 +1,7 @@
 import { useCallback, useMemo, useRef } from 'react'
 import { useAppStore } from '@/store'
 import { prChecksCacheSuffix, prCommentsCacheSuffix } from '@/store/github/cache-identity'
-import { getGitHubRepoCacheKey } from '@/store/slices/github-cache-key'
+import { getGitHubRepoCacheKey } from '../../../../../shared/github/github-cache-key'
 import {
   buildChecksPanelEligibilityGitFingerprint,
   readChecksPanelGitStatusSnapshot,
diff --git a/src/renderer/src/components/right-sidebar/parent-pr-checks-github-pr-cache.ts b/src/renderer/src/components/right-sidebar/parent-pr-checks-github-pr-cache.ts
index 609fb6fd56f..9f28978f095 100644
--- a/src/renderer/src/components/right-sidebar/parent-pr-checks-github-pr-cache.ts
+++ b/src/renderer/src/components/right-sidebar/parent-pr-checks-github-pr-cache.ts
@@ -9,7 +9,10 @@ import {
 } from '../../../../shared/execution-host'
 import { isCachedMergedBranchPRCurrentForWorktree } from '@/components/sidebar/worktree-card-pr-display'
 import type { AppState } from '@/store/types'
-import { getGitHubPRCacheKey, getLegacyGitHubPRCacheKey } from '@/store/slices/github-cache-key'
+import {
+  getGitHubPRCacheKey,
+  getLegacyGitHubPRCacheKey
+} from '../../../../shared/github/github-cache-key'
 import type { ParentPrChecksCacheEntry } from './parent-pr-checks-row-types'
 
 export function canUseParentPrChecksGitHubPRCacheEntry(
diff --git a/src/renderer/src/components/right-sidebar/parent-pr-checks-rows.test.ts b/src/renderer/src/components/right-sidebar/parent-pr-checks-rows.test.ts
index af76ad86d87..6d4af405aff 100644
--- a/src/renderer/src/components/right-sidebar/parent-pr-checks-rows.test.ts
+++ b/src/renderer/src/components/right-sidebar/parent-pr-checks-rows.test.ts
@@ -9,7 +9,7 @@ import {
   getGitHubPRCacheKey,
   getGitHubRepoCacheKey,
   getLegacyGitHubPRCacheKey
-} from '@/store/slices/github-cache-key'
+} from '../../../../shared/github/github-cache-key'
 import { prChecksCacheSuffix } from '@/store/github/cache-identity'
 import {
   buildParentPrChecksProjection,
diff --git a/src/renderer/src/components/right-sidebar/parent-pr-checks-rows.ts b/src/renderer/src/components/right-sidebar/parent-pr-checks-rows.ts
index 6e52bd4c6df..cb17cbba194 100644
--- a/src/renderer/src/components/right-sidebar/parent-pr-checks-rows.ts
+++ b/src/renderer/src/components/right-sidebar/parent-pr-checks-rows.ts
@@ -7,7 +7,7 @@ import { isFolderRepo } from '../../../../shared/repo-kind'
 import { isGitHubPRSuppressed } from '../../../../shared/worktree/github-pr-suppression'
 import { getWorktreeCardPrDisplay } from '@/components/sidebar/worktree-card-pr-display'
 import { getWorktreeGitIdentityDisplay } from '../../../../shared/worktree/git-identity-display'
-import { getGitHubRepoCacheKey } from '@/store/slices/github-cache-key'
+import { getGitHubRepoCacheKey } from '../../../../shared/github/github-cache-key'
 import {
   getHostedReviewCacheKey,
   linkedReviewHintKey
diff --git a/src/renderer/src/components/right-sidebar/source-control/listing/use-worktree-context.ts b/src/renderer/src/components/right-sidebar/source-control/listing/use-worktree-context.ts
index 7f234a8915c..bf035487e0f 100644
--- a/src/renderer/src/components/right-sidebar/source-control/listing/use-worktree-context.ts
+++ b/src/renderer/src/components/right-sidebar/source-control/listing/use-worktree-context.ts
@@ -5,7 +5,7 @@ import { resolveRepoWorktreeLaunchPlatform } from '@/lib/execution-host-facts'
 import { getWorktreeGitIdentityDisplay } from '../../../../../../shared/worktree/git-identity-display'
 import { useAppStore } from '@/store'
 import { useActiveWorktree, useRepoById, useWorktreeMap } from '@/store/selectors'
-import { getGitHubPRCacheKey } from '@/store/slices/github-cache-key'
+import { getGitHubPRCacheKey } from '../../../../../../shared/github/github-cache-key'
 import { getHostedReviewCacheKey } from '@/store/slices/hosted-review-cache-identity'
 import type { GitBranchChangeEntry } from '../../../../../../shared/git-diff-compare-types'
 import type { GitStatusEntry } from '../../../../../../shared/git-status-types'
diff --git a/src/renderer/src/components/sidebar/agent-send-picker-collapse.test.tsx b/src/renderer/src/components/sidebar/agent-send-picker-collapse.test.tsx
index 3c5e8719227..f0026d63ee7 100644
--- a/src/renderer/src/components/sidebar/agent-send-picker-collapse.test.tsx
+++ b/src/renderer/src/components/sidebar/agent-send-picker-collapse.test.tsx
@@ -98,7 +98,6 @@ for (const hostId of ['ssh:builder', 'runtime:builder'] as const) {
         worktreeLineageById: {},
         prCache: null,
         workspaceStatuses,
-        settings,
         projectGroups: [],
         projectGrouping,
         folderWorkspaces: [],
@@ -153,7 +152,6 @@ for (const hostId of ['local', 'ssh:builder', 'runtime:builder'] as const) {
         worktreeLineageById,
         prCache: null,
         workspaceStatuses,
-        settings,
         projectGroups: [],
         projectGrouping,
         folderWorkspaces: [],
@@ -212,7 +210,6 @@ it.each([true, false])('reveals the target with pinned ancestors visible=%s', (v
         worktreeLineageById,
         prCache: null,
         workspaceStatuses,
-        settings,
         projectGroups: [],
         projectGrouping,
         folderWorkspaces: [],
diff --git a/src/renderer/src/components/sidebar/rendered-sidebar-worktree-order.ts b/src/renderer/src/components/sidebar/rendered-sidebar-worktree-order.ts
index c4caf54464e..8fb13e2f13f 100644
--- a/src/renderer/src/components/sidebar/rendered-sidebar-worktree-order.ts
+++ b/src/renderer/src/components/sidebar/rendered-sidebar-worktree-order.ts
@@ -78,7 +78,7 @@ export function computeRenderedSidebarRows(
     groupBy: state.groupBy,
     worktrees: [...visibleWorktrees],
     repoMap,
-    prGroupOf: createSidebarPRGroupReader(repoMap, prCache, state.settings),
+    prGroupOf: createSidebarPRGroupReader(repoMap, prCache),
     repoOrder: getLogicalRepoOrderRankById(state.repos.map((repo) => repo.id)),
     workspaceStatuses: state.workspaceStatuses,
     projectOrderBy: state.projectOrderBy,
diff --git a/src/renderer/src/components/sidebar/use-worktree-card-review-details.ts b/src/renderer/src/components/sidebar/use-worktree-card-review-details.ts
index 81a12fd438c..d9c91bed8b0 100644
--- a/src/renderer/src/components/sidebar/use-worktree-card-review-details.ts
+++ b/src/renderer/src/components/sidebar/use-worktree-card-review-details.ts
@@ -5,7 +5,7 @@ import { getWorkspaceAttachmentSourceContext } from './workspace-attachment-sour
 import { getWorkspaceReferenceLinearWorkspaceId } from './workspace-reference-details'
 import { getWorktreeGitIdentityDisplay } from '../../../../shared/worktree/git-identity-display'
 import { useAppStore } from '@/store'
-import { getGitHubPRCacheKey } from '@/store/slices/github-cache-key'
+import { getGitHubPRCacheKey } from '../../../../shared/github/github-cache-key'
 import { issueCacheKey as getIssueCacheKey } from '@/store/github/cache-identity'
 import { getHostedReviewCacheKey } from '@/store/slices/hosted-review-cache-identity'
 import { hostedReviewInfoFromGitHubPRInfo } from '../../../../shared/hosted-review-github'
diff --git a/src/renderer/src/components/sidebar/worktree-list/grouping/build-rows.test-fixture.ts b/src/renderer/src/components/sidebar/worktree-list/grouping/build-rows.test-fixture.ts
index e186629f475..212e88fb618 100644
--- a/src/renderer/src/components/sidebar/worktree-list/grouping/build-rows.test-fixture.ts
+++ b/src/renderer/src/components/sidebar/worktree-list/grouping/build-rows.test-fixture.ts
@@ -21,6 +21,7 @@ import type {
   WorktreeGroupBy
 } from '../../../../../../shared/sidebar-list/row-types'
 import { planSidebarRows } from '../../../../../../shared/sidebar-list/sidebar-row-plan'
+import type { PRCacheView } from '../../../../../../shared/sidebar-list/workspace-review-facts'
 import { createSidebarPRGroupReader } from './pr-group-key'
 
 /** Test-only positional entry to the shared row builder, with the window's defaults. */
@@ -28,7 +29,7 @@ export function buildSidebarRowPlan(
   groupBy: WorktreeGroupBy,
   worktrees: Worktree[],
   repoMap: Map<string, Repo>,
-  prCache: Record<string, unknown> | null,
+  prCache: PRCacheView | null,
   _collapsedGroups: Set<string>,
   repoOrder?: Map<string, number>,
   workspaceStatuses: readonly WorkspaceStatusDefinition[] = cloneDefaultWorkspaceStatuses(),
@@ -56,7 +57,7 @@ export function buildSidebarRowPlan(
     groupBy,
     worktrees,
     repoMap,
-    prGroupOf: createSidebarPRGroupReader(repoMap, prCache, settings),
+    prGroupOf: createSidebarPRGroupReader(repoMap, prCache),
     repoOrder,
     workspaceStatuses,
     projectOrderBy,
diff --git a/src/renderer/src/components/sidebar/worktree-list/grouping/build-rows.test.ts b/src/renderer/src/components/sidebar/worktree-list/grouping/build-rows.test.ts
index c4a58a64fcf..f97b9bf9206 100644
--- a/src/renderer/src/components/sidebar/worktree-list/grouping/build-rows.test.ts
+++ b/src/renderer/src/components/sidebar/worktree-list/grouping/build-rows.test.ts
@@ -65,20 +65,6 @@ describe('getPRGroupKey', () => {
     expect(getPRGroupKey(worktree, repoMap, prCache)).toBe('closed')
   })
 
-  it('uses local PR cache for a known local repo while a runtime is focused', () => {
-    const prCache = {
-      'repo-1::feature/super-critical': {
-        data: { state: 'merged' }
-      }
-    }
-
-    expect(
-      getPRGroupKey(worktree, repoMap, prCache, {
-        activeRuntimeEnvironmentId: 'env-1'
-      } as never)
-    ).toBe('done')
-  })
-
   it('uses SSH-scoped PR cache entries instead of local entries for SSH repos', () => {
     const sshRepo = { ...repo, connectionId: 'ssh-1' }
     const sshRepoMap = new Map([[sshRepo.id, sshRepo]])
diff --git a/src/renderer/src/components/sidebar/worktree-list/grouping/cross-project-lineage.test.ts b/src/renderer/src/components/sidebar/worktree-list/grouping/cross-project-lineage.test.ts
index 57c34d5ca0d..bad2645ee05 100644
--- a/src/renderer/src/components/sidebar/worktree-list/grouping/cross-project-lineage.test.ts
+++ b/src/renderer/src/components/sidebar/worktree-list/grouping/cross-project-lineage.test.ts
@@ -184,7 +184,6 @@ describe('cross-project sidebar lineage', () => {
         pinnedDisplayPolicy: policy,
         prCache: null,
         workspaceStatuses: [],
-        settings: null,
         projectGroups: [group]
       })
       for (const key of keys) {
diff --git a/src/renderer/src/components/sidebar/worktree-list/grouping/pr-group-key.ts b/src/renderer/src/components/sidebar/worktree-list/grouping/pr-group-key.ts
index af734392662..1f3ff05d1cc 100644
--- a/src/renderer/src/components/sidebar/worktree-list/grouping/pr-group-key.ts
+++ b/src/renderer/src/components/sidebar/worktree-list/grouping/pr-group-key.ts
@@ -1,72 +1,27 @@
-import type { AppState } from '@/store/types'
-import { branchName } from '@/lib/git-utils'
-import { getGitHubPRCacheKey, getLegacyGitHubPRCacheKey } from '@/store/slices/github-cache-key'
 import type { Repo } from '../../../../../../shared/repo-types'
 import type { Worktree } from '../../../../../../shared/worktree/types'
-import { isGitHubPRSuppressed } from '../../../../../../shared/worktree/github-pr-suppression'
-import {
-  getPRGroupKeyForState,
-  type PRGroupKey
-} from '../../../../../../shared/workspace-view/workspace-pr-groups'
+import type { PRGroupKey } from '../../../../../../shared/workspace-view/workspace-pr-groups'
 import type { SidebarPRGroupReader } from '../../../../../../shared/sidebar-list/row-types'
+import {
+  prGroupOfReviewFact,
+  readWorkspaceReviewFact,
+  type PRCacheView
+} from '../../../../../../shared/sidebar-list/workspace-review-facts'
 
 export function getPRGroupKey(
   worktree: Worktree,
   repoMap: Map<string, Repo>,
-  prCache: Record<string, unknown> | null,
-  settings?: AppState['settings']
+  prCache: PRCacheView | null
 ): PRGroupKey {
-  const repo = repoMap.get(worktree.repoId)
-  const branch = branchName(worktree.branch)
-  const repoScopedCacheKey =
-    repo && branch
-      ? getGitHubPRCacheKey(
-          repo.path,
-          repo.id,
-          branch,
-          settings,
-          repo.connectionId,
-          repo.executionHostId,
-          true
-        )
-      : ''
-  const canUseLegacyPRCache = repo !== undefined && !repo.connectionId && !repo.executionHostId
-  const legacyRepoScopedCacheKey =
-    canUseLegacyPRCache && branch ? getLegacyGitHubPRCacheKey(repo.path, repo.id, branch) : ''
-  const legacyPathScopedCacheKey =
-    canUseLegacyPRCache && branch ? getLegacyGitHubPRCacheKey(repo.path, undefined, branch) : ''
-  // Why: PR refreshes now write repo-id scoped entries; legacy path entries may
-  // still exist from persisted cache, but must not override fresher repo data.
-  const prEntry = prCache
-    ? ((repoScopedCacheKey
-        ? (prCache[repoScopedCacheKey] as
-            | { data?: { number?: number; state?: string } }
-            | undefined)
-        : undefined) ??
-      (legacyRepoScopedCacheKey
-        ? (prCache[legacyRepoScopedCacheKey] as
-            | { data?: { number?: number; state?: string } }
-            | undefined)
-        : undefined) ??
-      (legacyPathScopedCacheKey
-        ? (prCache[legacyPathScopedCacheKey] as
-            | { data?: { number?: number; state?: string } }
-            | undefined)
-        : undefined))
-    : undefined
-  const pr = prEntry?.data
-
-  if (!pr || (typeof pr.number === 'number' && isGitHubPRSuppressed(worktree, pr.number))) {
-    return 'in-progress'
-  }
-  return getPRGroupKeyForState(pr.state ?? '')
+  return prGroupOfReviewFact(
+    prCache ? readWorkspaceReviewFact(worktree, repoMap.get(worktree.repoId), prCache) : null
+  )
 }
 
 /** The PR lane reader the shared builder takes, bound to the window's PR cache. */
 export function createSidebarPRGroupReader(
   repoMap: Map<string, Repo>,
-  prCache: Record<string, unknown> | null,
-  settings?: AppState['settings']
+  prCache: PRCacheView | null
 ): SidebarPRGroupReader {
-  return (worktree) => getPRGroupKey(worktree, repoMap, prCache, settings)
+  return (worktree) => getPRGroupKey(worktree, repoMap, prCache)
 }
diff --git a/src/renderer/src/components/sidebar/worktree-list/listing/use-collapsed-groups.ts b/src/renderer/src/components/sidebar/worktree-list/listing/use-collapsed-groups.ts
index 054b3e14fd3..05ccf990aa0 100644
--- a/src/renderer/src/components/sidebar/worktree-list/listing/use-collapsed-groups.ts
+++ b/src/renderer/src/components/sidebar/worktree-list/listing/use-collapsed-groups.ts
@@ -31,7 +31,6 @@ export function useEffectiveCollapsedGroups(args: {
   worktreeLineageById: Record<string, WorktreeLineage>
   prCache: AppState['prCache'] | null
   workspaceStatuses: readonly WorkspaceStatusDefinition[]
-  settings: AppState['settings']
   projectGroups: readonly ProjectGroup[]
   projectGrouping: ProjectGroupingModel
   folderWorkspaces: readonly FolderWorkspace[]
@@ -52,7 +51,6 @@ export function useEffectiveCollapsedGroups(args: {
     worktreeLineageById,
     prCache,
     workspaceStatuses,
-    settings,
     projectGroups,
     projectGrouping,
     folderWorkspaces,
@@ -97,7 +95,6 @@ export function useEffectiveCollapsedGroups(args: {
       pinnedDisplayPolicy,
       prCache,
       workspaceStatuses,
-      settings,
       projectGroups,
       projectGrouping
     })) {
@@ -118,7 +115,6 @@ export function useEffectiveCollapsedGroups(args: {
     projectGroups,
     projectGrouping,
     repoMap,
-    settings,
     workspaceStatuses,
     worktreeLineageById,
     worktreeMap,
diff --git a/src/renderer/src/components/sidebar/worktree-list/listing/use-section-rows.ts b/src/renderer/src/components/sidebar/worktree-list/listing/use-section-rows.ts
index f19a56fd43d..b8128d570b3 100644
--- a/src/renderer/src/components/sidebar/worktree-list/listing/use-section-rows.ts
+++ b/src/renderer/src/components/sidebar/worktree-list/listing/use-section-rows.ts
@@ -149,7 +149,7 @@ export function useSidebarSectionRows(args: SectionRowsArgs) {
         groupBy: args.groupBy,
         worktrees,
         repoMap,
-        prGroupOf: createSidebarPRGroupReader(repoMap, args.prCache, args.settings),
+        prGroupOf: createSidebarPRGroupReader(repoMap, args.prCache),
         repoOrder,
         workspaceStatuses: args.workspaceStatuses,
         projectOrderBy: args.projectOrderBy,
@@ -179,7 +179,6 @@ export function useSidebarSectionRows(args: SectionRowsArgs) {
       args.projectOrderBy,
       args.worktreeLineageById,
       args.worktreeMap,
-      args.settings,
       args.projectGrouping,
       args.visibleProjectGroupsForRows,
       args.visibleFolderWorkspacesForRows,
@@ -207,7 +206,6 @@ export function useSidebarSectionRows(args: SectionRowsArgs) {
     worktreeLineageById: args.worktreeLineageById,
     prCache: args.prCache,
     workspaceStatuses: args.workspaceStatuses,
-    settings: args.settings,
     projectGroups: args.visibleProjectGroupsForRows,
     projectGrouping: args.projectGrouping,
     folderWorkspaces: args.visibleFolderWorkspacesForRows,
diff --git a/src/renderer/src/components/sidebar/worktree-list/navigation/worktree-reveal-group-keys.ts b/src/renderer/src/components/sidebar/worktree-list/navigation/worktree-reveal-group-keys.ts
index 2b136071fd3..49e4838bbfb 100644
--- a/src/renderer/src/components/sidebar/worktree-list/navigation/worktree-reveal-group-keys.ts
+++ b/src/renderer/src/components/sidebar/worktree-list/navigation/worktree-reveal-group-keys.ts
@@ -34,7 +34,6 @@ export function getWorktreeRevealCollapsedGroupKeys(args: {
   pinnedDisplayPolicy: PinnedWorktreeDisplayPolicy
   prCache: AppState['prCache'] | null
   workspaceStatuses: readonly WorkspaceStatusDefinition[]
-  settings: AppState['settings']
   projectGroups: readonly ProjectGroup[]
   projectGrouping?: ProjectGroupingModel
 }): string[] {
@@ -49,7 +48,7 @@ export function getWorktreeRevealCollapsedGroupKeys(args: {
       groupBy: args.groupBy,
       worktrees: [...(args.visibleWorktrees ?? args.worktrees)],
       repoMap: args.repoMap,
-      prGroupOf: createSidebarPRGroupReader(args.repoMap, args.prCache, args.settings),
+      prGroupOf: createSidebarPRGroupReader(args.repoMap, args.prCache),
       workspaceStatuses: args.workspaceStatuses,
       projectOrderBy: 'manual',
       lineageById: { ...args.worktreeLineageById },
diff --git a/src/renderer/src/lib/sidebar-shadow/workspace-review-shadow.ts b/src/renderer/src/lib/sidebar-shadow/workspace-review-shadow.ts
new file mode 100644
index 00000000000..ab2fe85c587
--- /dev/null
+++ b/src/renderer/src/lib/sidebar-shadow/workspace-review-shadow.ts
@@ -0,0 +1,40 @@
+import { useAppStore } from '@/store'
+import { getAllWorktreesFromState } from '@/store/selectors'
+import {
+  buildWorkspaceReviewFacts,
+  workspaceReviewFactsEqual,
+  WorkspaceReviewFactsSnapshotSchema,
+  type WorkspaceReviewFact
+} from '../../../../shared/sidebar-list/workspace-review-facts'
+import { defineSidebarShadowDomain } from './sidebar-shadow-comparison'
+import { toLocallyOwnedRows } from './workspace-activity-shadow'
+
+/**
+ * Checks main's copy of the PR cache, and how it keys rows, against the window's own cache. An SSH
+ * host that was down when main started has no rows in main yet, so its PR rows can read as mismatches.
+ */
+export const workspaceReviewShadow = defineSidebarShadowDomain<WorkspaceReviewFact>({
+  name: 'workspace-review',
+  readWindow: () => {
+    const state = useAppStore.getState()
+    const facts = buildWorkspaceReviewFacts(
+      getAllWorktreesFromState(state),
+      state.repos,
+      state.prCache
+    )
+    return toLocallyOwnedRows(state, new Map(Object.entries(facts)))
+  },
+  readMain: async () => {
+    const response = await window.api.runtime.call({ method: 'sidebarInputs.reviewFacts' })
+    const parsed = response.ok
+      ? WorkspaceReviewFactsSnapshotSchema.safeParse(response.result)
+      : null
+    if (!parsed?.success) {
+      return null
+    }
+    return {
+      values: toLocallyOwnedRows(useAppStore.getState(), new Map(Object.entries(parsed.data.facts)))
+    }
+  },
+  equals: workspaceReviewFactsEqual
+})
diff --git a/src/renderer/src/main.tsx b/src/renderer/src/main.tsx
index c0148f81c34..a31220ff135 100644
--- a/src/renderer/src/main.tsx
+++ b/src/renderer/src/main.tsx
@@ -32,6 +32,7 @@ import {
   pairedServerRowsShadow
 } from './lib/sidebar-shadow/paired-server-rows-shadow'
 import { desktopFactsShadow } from './lib/sidebar-shadow/desktop-facts-shadow'
+import { workspaceReviewShadow } from './lib/sidebar-shadow/workspace-review-shadow'
 
 const disposeOsFileDropGuard = installOsFileDropCancellationGuard()
 import.meta.hot?.dispose(disposeOsFileDropGuard)
@@ -43,7 +44,8 @@ const disposeSidebarShadow = installSidebarShadowComparison([
   workspaceActivityShadow,
   pairedServerRowsShadow,
   pairedServerHostsShadow,
-  desktopFactsShadow
+  desktopFactsShadow,
+  workspaceReviewShadow
 ])
 import.meta.hot?.dispose(disposeSidebarShadow)
 
diff --git a/src/renderer/src/store/github/cache-identity.ts b/src/renderer/src/store/github/cache-identity.ts
index 2d62d265ed9..cdf53ef07f3 100644
--- a/src/renderer/src/store/github/cache-identity.ts
+++ b/src/renderer/src/store/github/cache-identity.ts
@@ -10,7 +10,10 @@ import {
   LOCAL_EXECUTION_HOST_ID,
   normalizeExecutionHostId
 } from '../../../../shared/execution-host'
-import { getGitHubPRCacheKey, getGitHubRepoCacheKey } from '../slices/github-cache-key'
+import {
+  getGitHubPRCacheKey,
+  getGitHubRepoCacheKey
+} from '../../../../shared/github/github-cache-key'
 import type { AppState } from '../types'
 import type { RuntimeClientTarget } from '../../../../shared/runtime-client-target'
 import type { CacheEntry } from './cache-model'
diff --git a/src/renderer/src/store/github/cache-persistence.test.ts b/src/renderer/src/store/github/cache-persistence.test.ts
index 70f21372dab..0a3c0e3b695 100644
--- a/src/renderer/src/store/github/cache-persistence.test.ts
+++ b/src/renderer/src/store/github/cache-persistence.test.ts
@@ -1,7 +1,6 @@
-import { setImmediate } from 'node:timers/promises'
 import { afterEach, beforeEach, expect, it, vi } from 'vitest'
 import { createTestStore } from '../slices/store-test-helpers'
-import { debouncedSaveCache } from './cache-persistence'
+import { persistGitHubCacheChanges } from './cache-persistence'
 
 const setGitHub = vi.fn()
 
@@ -17,48 +16,34 @@ afterEach(() => {
   vi.unstubAllGlobals()
 })
 
-it('releases unrelated discarded renderer state while the cache save is pending', async () => {
+const prEntry = (fetchedAt: number) => ({ data: null, fetchedAt })
+
+it('writes main within a second of a change, never before one', () => {
   const store = createTestStore()
-  const schedule = () => {
-    const drafts = { closedFile: Buffer.alloc(8 * 1024 * 1024, 65).toString('utf8') }
-    const state = { ...store.getState(), editorDrafts: drafts }
-    debouncedSaveCache(state)
-    return { state: new WeakRef(state), drafts: new WeakRef(drafts) }
-  }
-  const discarded = schedule()
-  if (!global.gc) {
-    throw new Error('config/vitest.config.ts must pass --expose-gc')
-  }
-  for (let turn = 0; turn < 3; turn += 1) {
-    await setImmediate()
-    global.gc()
-  }
-
+  persistGitHubCacheChanges(store)
+  vi.advanceTimersByTime(5000)
   expect(setGitHub).not.toHaveBeenCalled()
-  expect(discarded.state.deref() === undefined).toBe(true)
-  expect(discarded.drafts.deref() === undefined).toBe(true)
-  vi.advanceTimersByTime(1000)
-  expect(setGitHub).toHaveBeenCalledOnce()
-})
 
-it('persists the latest requested cache maps once after the trailing second', () => {
-  const state = createTestStore().getState()
-  const first = { ...state, prCache: {}, issueCache: {} }
-  const latest = { ...state, prCache: {}, issueCache: {} }
-  debouncedSaveCache(first)
+  store.setState({ prCache: { a: prEntry(1) } })
   vi.advanceTimersByTime(999)
-  expect(setGitHub).not.toHaveBeenCalled()
-
-  debouncedSaveCache(latest)
-  vi.advanceTimersByTime(999)
-  expect(setGitHub).not.toHaveBeenCalled()
+  // A later change rides the open window instead of pushing the write back.
+  store.setState({ prCache: { a: prEntry(2) } })
   vi.advanceTimersByTime(1)
   expect(setGitHub).toHaveBeenCalledOnce()
-  expect(setGitHub.mock.calls[0][0]).toEqual({
-    cache: { pr: latest.prCache, issue: latest.issueCache }
-  })
-  expect(setGitHub.mock.calls[0][0].cache.pr).toBe(latest.prCache)
-  expect(setGitHub.mock.calls[0][0].cache.issue).toBe(latest.issueCache)
+  expect(setGitHub.mock.calls[0][0].cache.pr).toBe(store.getState().prCache)
+  expect(setGitHub.mock.calls[0][0].cache.issue).toBe(store.getState().issueCache)
+})
+
+it('ignores state that is not a GitHub cache and installs once per store', () => {
+  const store = createTestStore()
+  persistGitHubCacheChanges(store)
+  persistGitHubCacheChanges(store)
+
+  store.setState({ checksCache: {} })
+  vi.advanceTimersByTime(1000)
+  expect(setGitHub).not.toHaveBeenCalled()
+
+  store.setState({ issueCache: {} })
   vi.advanceTimersByTime(1000)
   expect(setGitHub).toHaveBeenCalledOnce()
 })
diff --git a/src/renderer/src/store/github/cache-persistence.ts b/src/renderer/src/store/github/cache-persistence.ts
index 10c0c67ef13..1a01d7f3837 100644
--- a/src/renderer/src/store/github/cache-persistence.ts
+++ b/src/renderer/src/store/github/cache-persistence.ts
@@ -1,19 +1,32 @@
+import type { StoreApi } from 'zustand'
 import type { AppState } from '../types'
 
-let saveTimer: ReturnType<typeof setTimeout> | null = null
+const SAVE_WINDOW_MS = 1000
+const persistedStores = new WeakSet<object>()
 
-/** Schedules the renderer's single trailing GitHub cache persistence write. */
-export function debouncedSaveCache(state: AppState): void {
-  clearTimeout(saveTimer ?? undefined)
-  // Keep unrelated renderer state out of the pending timer's closure.
-  const { prCache, issueCache } = state
-  saveTimer = setTimeout(() => {
-    saveTimer = null
-    window.api.cache.setGitHub({
-      cache: {
-        pr: prCache,
-        issue: issueCache
-      }
-    })
-  }, 1000)
+/**
+ * Mirrors the PR and issue caches to main whenever either changes, so every writer is covered.
+ * Main derives the sidebar's PR facts from this copy. A fixed window, not a resettable debounce:
+ * a steady stream of results still reaches main within a second. Once per store.
+ */
+export function persistGitHubCacheChanges(
+  store: Pick<StoreApi<AppState>, 'getState' | 'subscribe'>
+): void {
+  if (persistedStores.has(store)) {
+    return
+  }
+  persistedStores.add(store)
+  let timer: ReturnType<typeof setTimeout> | null = null
+  const schedule = (): void => {
+    timer ??= setTimeout(() => {
+      timer = null
+      const { prCache, issueCache } = store.getState()
+      window.api.cache.setGitHub({ cache: { pr: prCache, issue: issueCache } })
+    }, SAVE_WINDOW_MS)
+  }
+  store.subscribe((state, previous) => {
+    if (state.prCache !== previous.prCache || state.issueCache !== previous.issueCache) {
+      schedule()
+    }
+  })
 }
diff --git a/src/renderer/src/store/github/check-actions.ts b/src/renderer/src/store/github/check-actions.ts
index ccdb84223e1..218609e7e99 100644
--- a/src/renderer/src/store/github/check-actions.ts
+++ b/src/renderer/src/store/github/check-actions.ts
@@ -18,7 +18,6 @@ import {
   sourceScopedRepoCacheKey
 } from './cache-identity'
 import { isFresh, withBoundedCacheEntry } from './cache-policy'
-import { debouncedSaveCache } from './cache-persistence'
 import {
   inflightChecksRequests,
   nextProviderRequestId,
@@ -93,7 +92,6 @@ export const createCheckActions = (
       )
       if (prStatusUpdate) {
         set(prStatusUpdate)
-        debouncedSaveCache(get())
       }
       return cachedChecks
     }
@@ -194,7 +192,6 @@ export const createCheckActions = (
 
         return nextState
       })
-      debouncedSaveCache(get())
       return checks
     })().finally(() => {
       if (ownsInflightRequest(inflightChecksRequests, inflightKey, requestId)) {
diff --git a/src/renderer/src/store/github/issue-actions.ts b/src/renderer/src/store/github/issue-actions.ts
index c881994a0f6..93c6bbcfd66 100644
--- a/src/renderer/src/store/github/issue-actions.ts
+++ b/src/renderer/src/store/github/issue-actions.ts
@@ -5,7 +5,6 @@ import type { IssueInfo } from '../../../../shared/github/pull-request-types'
 import { callRuntimeRpc } from '../../runtime/runtime-rpc-client'
 import { sourceScopedRepoCacheKey } from './cache-identity'
 import { isFresh, withBoundedCacheEntry } from './cache-policy'
-import { debouncedSaveCache } from './cache-persistence'
 import { inflightIssueRequests } from './request-coordination'
 import { findRepoForGitHubOwner } from './repository-routing'
 import {
@@ -71,7 +70,6 @@ export const createIssueActions = (
             fetchedAt: Date.now()
           })
         }))
-        debouncedSaveCache(get())
         return issue
       } catch (err) {
         console.error('Failed to fetch issue:', err)
@@ -81,7 +79,6 @@ export const createIssueActions = (
             fetchedAt: Date.now()
           })
         }))
-        debouncedSaveCache(get())
         return null
       } finally {
         inflightIssueRequests.delete(cacheKey)
diff --git a/src/renderer/src/store/github/pull-request-execution.ts b/src/renderer/src/store/github/pull-request-execution.ts
index 320094f7466..10a74ea23e5 100644
--- a/src/renderer/src/store/github/pull-request-execution.ts
+++ b/src/renderer/src/store/github/pull-request-execution.ts
@@ -14,7 +14,6 @@ import type {
 import { normalizeGitHubPRForBranchOutcome } from '../../../../shared/github/pull-request-for-branch-outcome'
 import { getRepoExecutionHostId, LOCAL_EXECUTION_HOST_ID } from '../../../../shared/execution-host'
 import { callRuntimeRpc } from '../../runtime/runtime-rpc-client'
-import { debouncedSaveCache } from './cache-persistence'
 import { inflightPRRequests, prRequestGenerations } from './request-coordination'
 import { getRuntimeRepoTarget } from './repository-routing'
 import { applyCachedChecksStatus } from './pr-check-status-cache'
@@ -153,7 +152,6 @@ export function startPullRequestLookup(args: {
       }
       if (prRequestGenerations.get(cacheKey) === generation) {
         let skippedStaleLinkedPRLookup = false
-        let didUpdatePRCache = false
         set((s) => {
           // Why: unlinking a PR mid exact-linked-PR-lookup must stop the older result from restoring the manual link UI.
           if (isStaleExactLinkedPRLookup(s, options?.worktreeId, linkedPRNumber)) {
@@ -189,15 +187,11 @@ export function startPullRequestLookup(args: {
             requestStartedAt,
             requestStartedEntry: requestStartedHostedReviewEntry
           })
-          didUpdatePRCache = updates.prCache !== undefined
           return updates.prCache || updates.hostedReviewCache ? updates : s
         })
         if (skippedStaleLinkedPRLookup) {
           return null
         }
-        if (didUpdatePRCache) {
-          debouncedSaveCache(get())
-        }
         const linkedPRWorktree =
           options?.worktreeId && linkedPRNumber != null
             ? findUniqueWorktreeById(
diff --git a/src/renderer/src/store/github/refresh-event-actions.ts b/src/renderer/src/store/github/refresh-event-actions.ts
index c345bb3c41d..41654288a3b 100644
--- a/src/renderer/src/store/github/refresh-event-actions.ts
+++ b/src/renderer/src/store/github/refresh-event-actions.ts
@@ -3,7 +3,6 @@ import type { AppState } from '../types'
 import type { GitHubSlice } from './slice-types'
 import { getHostedReviewCacheKey } from '../slices/hosted-review-cache-identity'
 import { applyCachedChecksStatus } from './pr-check-status-cache'
-import { debouncedSaveCache } from './cache-persistence'
 import {
   capPrRefreshSequences,
   capPrRefreshStates,
@@ -48,7 +47,6 @@ export const createRefreshEventActions = (
       requestHeadOid: string | null
       executionHostId: string
     }[] = []
-    let didUpdatePRCache = false
     set((s) => {
       let linkedWorktreeLookupIndex: WorktreeLookupIndex | undefined
       const nextSequences = { ...s.prRefreshSequences }
@@ -188,7 +186,6 @@ export const createRefreshEventActions = (
             requestStartedAt: event.requestStartedAt,
             requestStartedEntry
           })
-          didUpdatePRCache = didUpdatePRCache || nextCaches.prCache !== nextPRCache
           nextPRCache = nextCaches.prCache
           nextHostedReviewCache = nextCaches.hostedReviewCache
           continue
@@ -243,9 +240,6 @@ export const createRefreshEventActions = (
           }
         : s
     })
-    if (didUpdatePRCache && event.outcome && event.outcome.kind !== 'upstream-error') {
-      debouncedSaveCache(get())
-    }
     for (const clear of divergedLinkedPRClears) {
       void get().updateWorktreeMeta(
         clear.worktreeId,
diff --git a/src/renderer/src/store/slices/github-cache-eviction-and-bounds.test.ts b/src/renderer/src/store/slices/github-cache-eviction-and-bounds.test.ts
index 8176bf64f6e..72c9773bcd2 100644
--- a/src/renderer/src/store/slices/github-cache-eviction-and-bounds.test.ts
+++ b/src/renderer/src/store/slices/github-cache-eviction-and-bounds.test.ts
@@ -214,7 +214,8 @@ describe('createGitHubSlice cache bounds', () => {
     vi.useRealTimers()
   })
 
-  it('bounds restored PR and issue caches', async () => {
+  it('bounds restored PR and issue caches, and tells main', async () => {
+    vi.useFakeTimers()
     const store = createTestStore()
     const pr = Object.fromEntries(
       Array.from({ length: 505 }, (_, index) => [
@@ -236,6 +237,10 @@ describe('createGitHubSlice cache bounds', () => {
     expect(Object.keys(store.getState().issueCache)).toHaveLength(500)
     expect(store.getState().prCache['repo-id::branch-0']).toBeUndefined()
     expect(store.getState().issueCache['repo-id::0']).toBeUndefined()
+    vi.advanceTimersByTime(1000)
+    expect(mockApi.cache.setGitHub).toHaveBeenLastCalledWith({
+      cache: { pr: store.getState().prCache, issue: store.getState().issueCache }
+    })
   })
 
   it('bounds PR and issue caches as fetches add entries', async () => {
diff --git a/src/renderer/src/store/slices/github-checks.ts b/src/renderer/src/store/slices/github-checks.ts
index 900c482ac7d..9668d159eee 100644
--- a/src/renderer/src/store/slices/github-checks.ts
+++ b/src/renderer/src/store/slices/github-checks.ts
@@ -1,7 +1,7 @@
 import type { AppState } from '../types'
 import type { PRCheckDetail } from '../../../../shared/github/check-types'
 import type { GitHubOwnerRepo } from '../../../../shared/github/pull-request-types'
-import { getGitHubPRCacheKey } from './github-cache-key'
+import { getGitHubPRCacheKey } from '../../../../shared/github/github-cache-key'
 import { githubRepoIdentityKey } from '../../../../shared/github/repository-identity-key'
 import { derivePRCheckStatus } from '../../../../shared/pr-check-status'
 
diff --git a/src/renderer/src/store/slices/github-issue-state-machine.test.ts b/src/renderer/src/store/slices/github-issue-state-machine.test.ts
index 4df798c799e..cfb9d79beb8 100644
--- a/src/renderer/src/store/slices/github-issue-state-machine.test.ts
+++ b/src/renderer/src/store/slices/github-issue-state-machine.test.ts
@@ -1,4 +1,5 @@
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import { persistGitHubCacheChanges } from '../github/cache-persistence'
 import type { IssueInfo } from '../../../../shared/github/pull-request-types'
 import { getTaskSourceCacheScope } from '../../../../shared/task-source-context'
 import { issueCacheKey } from '../github/cache-identity'
@@ -57,6 +58,7 @@ describe('createGitHubSlice.fetchIssue state machine', () => {
     const sourceContext = githubSourceContext('local', 'source-repo')
     const cacheKey = `${getTaskSourceCacheScope(sourceContext)}::repo-1::42`
     mockApi.gh.issue.mockRejectedValueOnce(new Error('offline'))
+    persistGitHubCacheChanges(store)
 
     await expect(
       store.getState().fetchIssue('/repo/one', 42, { repoId: 'repo-1', sourceContext })
diff --git a/src/renderer/src/store/slices/github-pr-checks-fetch.test.ts b/src/renderer/src/store/slices/github-pr-checks-fetch.test.ts
index ff493301e35..74d29b79d53 100644
--- a/src/renderer/src/store/slices/github-pr-checks-fetch.test.ts
+++ b/src/renderer/src/store/slices/github-pr-checks-fetch.test.ts
@@ -1,4 +1,5 @@
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import { persistGitHubCacheChanges } from '../github/cache-persistence'
 import { prChecksCacheSuffix, prCommentsCacheSuffix } from '../github/cache-identity'
 import {
   createTestStore,
@@ -227,6 +228,7 @@ describe('createGitHubSlice.fetchPRChecks', () => {
     mockApi.gh.prChecks.mockResolvedValue([
       { name: 'build', status: 'completed', conclusion: 'success', url: null }
     ])
+    persistGitHubCacheChanges(store)
 
     await store
       .getState()
@@ -266,6 +268,7 @@ describe('createGitHubSlice.fetchPRChecks', () => {
       }
     })
 
+    persistGitHubCacheChanges(store)
     await store.getState().fetchPRChecks(repoPath, 12, branch, undefined, null, { repoId })
     await vi.advanceTimersByTimeAsync(1000)
 
diff --git a/src/renderer/src/store/slices/github-pr-rejected-cache.test.ts b/src/renderer/src/store/slices/github-pr-rejected-cache.test.ts
index 921828e75c1..edf6cfbb419 100644
--- a/src/renderer/src/store/slices/github-pr-rejected-cache.test.ts
+++ b/src/renderer/src/store/slices/github-pr-rejected-cache.test.ts
@@ -1,4 +1,5 @@
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import { persistGitHubCacheChanges } from '../github/cache-persistence'
 import { hostedReviewInfoFromGitHubPRInfo } from '../../../../shared/hosted-review-github'
 import { _clearGitHubPRRefreshStartedEntriesForTest } from '../github/request-coordination'
 import { getHostedReviewCacheKey } from './hosted-review-cache-identity'
@@ -82,6 +83,7 @@ describe.each(['manual', 'coordinator'] as const)('%s rejected PR cache results'
       }
     })
     const outcome = { kind: 'no-pr' as const, fetchedAt: 2, rejectedPRUrls: [rejectedUrl] }
+    persistGitHubCacheChanges(store)
     if (source === 'manual') {
       mockApi.gh.refreshPRNow.mockResolvedValueOnce(outcome)
       await expect(
diff --git a/src/renderer/src/store/slices/github.ts b/src/renderer/src/store/slices/github.ts
index c8efa24ff46..4d3b2f5335d 100644
--- a/src/renderer/src/store/slices/github.ts
+++ b/src/renderer/src/store/slices/github.ts
@@ -7,6 +7,7 @@ import {
   isExpiredActivePRRefreshState
 } from '../github/pr-refresh-state'
 import { evictStaleEntries } from '../github/cache-policy'
+import { persistGitHubCacheChanges } from '../github/cache-persistence'
 import { createProjectActions } from '../github/project-actions'
 import { createProjectRowActions } from '../github/project-row-actions'
 import { createWorkItemFetchActions } from '../github/work-item-fetch-actions'
@@ -25,7 +26,11 @@ import { createRefreshEventActions } from '../github/refresh-event-actions'
 import { createRefreshSweepActions } from '../github/refresh-sweep-actions'
 export type GitHubSlice = GitHubSliceContract
 
-export const createGitHubSlice: StateCreator<AppState, [], [], GitHubSlice> = (set, get) => ({
+export const createGitHubSlice: StateCreator<AppState, [], [], GitHubSlice> = (
+  set,
+  get,
+  store
+) => ({
   prCache: {},
   issueCache: {},
   checksCache: {},
@@ -91,16 +96,20 @@ export const createGitHubSlice: StateCreator<AppState, [], [], GitHubSlice> = (s
   ...createWorkItemMutationActions(set, get),
 
   initGitHubCache: async () => {
+    let persisted: Awaited<ReturnType<typeof window.api.cache.getGitHub>> | null = null
     try {
-      const persisted = await window.api.cache.getGitHub()
-      if (persisted) {
-        set({
-          prCache: evictStaleEntries(persisted.pr || {}),
-          issueCache: evictStaleEntries(persisted.issue || {})
-        })
-      }
+      persisted = await window.api.cache.getGitHub()
     } catch (err) {
       console.error('Failed to load GitHub cache from disk:', err)
     }
+    // Why after the read: an earlier write would replace main's copy with a partial cache.
+    // Before hydrating, so main also drops entries hydration evicts.
+    persistGitHubCacheChanges(store)
+    if (persisted) {
+      set({
+        prCache: evictStaleEntries(persisted.pr || {}),
+        issueCache: evictStaleEntries(persisted.issue || {})
+      })
+    }
   }
 })
diff --git a/src/renderer/src/store/slices/hosted-review-pr-cache.ts b/src/renderer/src/store/slices/hosted-review-pr-cache.ts
index b58d3e01994..957438d8f4b 100644
--- a/src/renderer/src/store/slices/hosted-review-pr-cache.ts
+++ b/src/renderer/src/store/slices/hosted-review-pr-cache.ts
@@ -1,7 +1,10 @@
 import type { HostedReviewInfo } from '../../../../shared/hosted-review'
 import type { Repo } from '../../../../shared/repo-types'
 import type { AppState } from '../types'
-import { getGitHubPRCacheKey, getLegacyGitHubPRCacheKey } from './github-cache-key'
+import {
+  getGitHubPRCacheKey,
+  getLegacyGitHubPRCacheKey
+} from '../../../../shared/github/github-cache-key'
 
 export function clearHostedReviewConflictingPrCache(args: {
   cache: NonNullable<AppState['prCache']>
diff --git a/src/renderer/src/store/slices/repo-owner-cache-identity.test.ts b/src/renderer/src/store/slices/repo-owner-cache-identity.test.ts
index 8580a184cf8..e29f5ae3359 100644
--- a/src/renderer/src/store/slices/repo-owner-cache-identity.test.ts
+++ b/src/renderer/src/store/slices/repo-owner-cache-identity.test.ts
@@ -1,5 +1,5 @@
 import { describe, expect, it } from 'vitest'
-import { getGitHubPRCacheKey } from './github-cache-key'
+import { getGitHubPRCacheKey } from '../../../../shared/github/github-cache-key'
 import { getHostedReviewCacheKey } from './hosted-review-cache-identity'
 
 const focusedRuntime = { activeRuntimeEnvironmentId: 'env-focused' }
diff --git a/src/renderer/src/store/slices/worktrees-metadata-persistence.test.ts b/src/renderer/src/store/slices/worktrees-metadata-persistence.test.ts
index 9b1579b7ee5..3f6d3db1776 100644
--- a/src/renderer/src/store/slices/worktrees-metadata-persistence.test.ts
+++ b/src/renderer/src/store/slices/worktrees-metadata-persistence.test.ts
@@ -3,7 +3,10 @@ import type { AppState } from '../types'
 import { toast } from 'sonner'
 import type { RuntimeEnvironmentCallRequest } from '../../runtime/runtime-compatibility-test-fixture'
 import { getHostedReviewCacheKey } from './hosted-review-cache-identity'
-import { getGitHubPRCacheKey, getLegacyGitHubPRCacheKey } from './github-cache-key'
+import {
+  getGitHubPRCacheKey,
+  getLegacyGitHubPRCacheKey
+} from '../../../../shared/github/github-cache-key'
 import { makeWorktree } from './worktrees-slice-test-fixtures'
 import {
   createTestStore,
diff --git a/src/renderer/src/store/slices/worktrees/metadata/update-worktree-meta.ts b/src/renderer/src/store/slices/worktrees/metadata/update-worktree-meta.ts
index 6ab8967102f..50f142883be 100644
--- a/src/renderer/src/store/slices/worktrees/metadata/update-worktree-meta.ts
+++ b/src/renderer/src/store/slices/worktrees/metadata/update-worktree-meta.ts
@@ -16,7 +16,7 @@ import { displayNameUpdatePinsLabel } from '../../../../../../shared/worktree/di
 import { parseWorkspaceKey } from '../../../../../../shared/workspace-scope'
 import { applyWorktreeUpdates, getRepoIdFromWorktreeId } from '../../worktree-helpers'
 import { getHostedReviewCacheKey } from '../../hosted-review-cache-identity'
-import { getGitHubPRCacheKey, getLegacyGitHubPRCacheKey } from '../../github-cache-key'
+import { getGitHubPRCacheKeyCandidates } from '../../../../../../shared/github/github-cache-key'
 import {
   applyDetectedWorktreeUpdates,
   findKnownWorktreeById,
@@ -201,26 +201,9 @@ export function createUpdateWorktreeMeta(
               true
             )
           : null
-      const prCacheKey =
-        reviewRepo && reviewBranch
-          ? getGitHubPRCacheKey(
-              reviewRepo.path,
-              reviewRepo.id,
-              reviewBranch,
-              s.settings,
-              reviewRepo.connectionId,
-              reviewRepo.executionHostId,
-              true
-            )
-          : null
       const prCacheKeys =
-        reviewRepo && reviewBranch
-          ? [
-              prCacheKey,
-              getLegacyGitHubPRCacheKey(reviewRepo.path, reviewRepo.id, reviewBranch),
-              getLegacyGitHubPRCacheKey(reviewRepo.path, undefined, reviewBranch)
-            ].filter((key): key is string => Boolean(key))
-          : []
+        reviewRepo && reviewBranch ? getGitHubPRCacheKeyCandidates(reviewRepo, reviewBranch) : []
+      const prCacheKey = prCacheKeys[0] ?? null
       const hostedReviewCache = s.hostedReviewCache ?? {}
       const prCache = s.prCache ?? {}
       if (
diff --git a/src/renderer/src/store/slices/github-cache-key.ts b/src/shared/github/github-cache-key.ts
similarity index 78%
rename from src/renderer/src/store/slices/github-cache-key.ts
rename to src/shared/github/github-cache-key.ts
index 1f5a22908c5..4bc08dd1bac 100644
--- a/src/renderer/src/store/slices/github-cache-key.ts
+++ b/src/shared/github/github-cache-key.ts
@@ -1,9 +1,9 @@
-import type { GlobalSettings } from '../../../../shared/global-settings-types'
+import type { GlobalSettings } from '../global-settings-types'
 import {
   LOCAL_EXECUTION_HOST_ID,
   normalizeExecutionHostId,
   toSshExecutionHostId
-} from '../../../../shared/execution-host'
+} from '../execution-host'
 
 type RuntimeFocusSettings = Pick<GlobalSettings, 'activeRuntimeEnvironmentId'> | null | undefined
 
@@ -87,3 +87,23 @@ export function getLegacyGitHubPRCacheKey(
 ): string {
   return getLegacyGitHubRepoCacheKey(repoPath, repoId, branch)
 }
+
+/** Every key a repo's branch PR may sit under in the cache, the repo-scoped one first. */
+export function getGitHubPRCacheKeyCandidates(
+  repo: { path: string; id: string; connectionId?: string | null; executionHostId?: string | null },
+  branch: string
+): string[] {
+  return [
+    getGitHubPRCacheKey(
+      repo.path,
+      repo.id,
+      branch,
+      null,
+      repo.connectionId,
+      repo.executionHostId,
+      true
+    ),
+    getLegacyGitHubPRCacheKey(repo.path, repo.id, branch),
+    getLegacyGitHubPRCacheKey(repo.path, undefined, branch)
+  ]
+}
diff --git a/src/shared/rpc-contract/rpc-params-catalog.generated.ts b/src/shared/rpc-contract/rpc-params-catalog.generated.ts
index da8fd28f489..6c72ccbb952 100644
--- a/src/shared/rpc-contract/rpc-params-catalog.generated.ts
+++ b/src/shared/rpc-contract/rpc-params-catalog.generated.ts
@@ -1247,6 +1247,7 @@ export const RPC_PARAMS_BY_METHOD = {
   'sidebarInputs.activityFacts': null,
   'sidebarInputs.desktopFacts': null,
   'sidebarInputs.pairedServerRows': null,
+  'sidebarInputs.reviewFacts': null,
   'skills.beginUpload': SkillUploadBeginRequestSchema,
   'skills.cancelInstall': SkillsCancelInstallParams,
   'skills.cancelUpload': SkillUploadCommitRequestSchema,
diff --git a/src/shared/sidebar-list/workspace-review-facts.test.ts b/src/shared/sidebar-list/workspace-review-facts.test.ts
new file mode 100644
index 00000000000..60c130753fc
--- /dev/null
+++ b/src/shared/sidebar-list/workspace-review-facts.test.ts
@@ -0,0 +1,60 @@
+import { describe, expect, it } from 'vitest'
+import {
+  buildWorkspaceReviewFacts,
+  prGroupOfReviewFact,
+  readWorkspaceReviewFact
+} from './workspace-review-facts'
+
+const repo = { id: 'repo-1', path: '/r', connectionId: null, executionHostId: null }
+const row = { id: 'repo-1::/r/a', repoId: 'repo-1', branch: 'refs/heads/a', linkedPR: null }
+const pr = (state: string, number = 7) => ({ data: { number, state } })
+
+describe('readWorkspaceReviewFact', () => {
+  it('prefers the repo-scoped entry over legacy ones', () => {
+    const cache = { 'repo-1::a': pr('merged'), '/r::a': pr('closed') }
+    expect(readWorkspaceReviewFact(row, repo, cache)).toEqual({
+      provider: 'github',
+      reviewState: 'merged'
+    })
+    expect(readWorkspaceReviewFact(row, repo, { '/r::a': pr('closed') })?.reviewState).toBe(
+      'closed'
+    )
+  })
+
+  it('reads only host-scoped entries for SSH and paired-server repos', () => {
+    const cache = { 'repo-1::a': pr('merged'), 'ssh:c1::repo-1::a': pr('open') }
+    expect(readWorkspaceReviewFact(row, { ...repo, connectionId: 'c1' }, cache)?.reviewState).toBe(
+      'open'
+    )
+    expect(
+      readWorkspaceReviewFact(row, { ...repo, executionHostId: 'runtime:env' }, cache)
+    ).toBeNull()
+  })
+
+  it('drops a PR the user unlinked, and rows with no repo, branch or PR', () => {
+    const cache = { 'repo-1::a': pr('open') }
+    expect(readWorkspaceReviewFact({ ...row, suppressedGitHubPR: 7 }, repo, cache)).toBeNull()
+    expect(
+      readWorkspaceReviewFact({ ...row, linkedPR: 7, suppressedGitHubPR: 7 }, repo, cache)
+    ).not.toBeNull()
+    expect(readWorkspaceReviewFact(row, undefined, cache)).toBeNull()
+    expect(readWorkspaceReviewFact({ ...row, branch: '' }, repo, cache)).toBeNull()
+    expect(readWorkspaceReviewFact(row, repo, { 'repo-1::a': { data: null } })).toBeNull()
+  })
+})
+
+describe('prGroupOfReviewFact', () => {
+  it('keeps rows without a PR in progress and lanes the rest by state', () => {
+    expect(prGroupOfReviewFact(null)).toBe('in-progress')
+    expect(prGroupOfReviewFact({ provider: 'github', reviewState: 'draft' })).toBe('in-progress')
+    expect(prGroupOfReviewFact({ provider: 'github', reviewState: '' })).toBe('in-review')
+    expect(prGroupOfReviewFact({ provider: 'github', reviewState: 'merged' })).toBe('done')
+  })
+})
+
+it('lists only rows with a PR', () => {
+  const other = { ...row, id: 'repo-1::/r/b', branch: 'b' }
+  expect(buildWorkspaceReviewFacts([row, other], [repo], { 'repo-1::a': pr('open') })).toEqual({
+    [row.id]: { provider: 'github', reviewState: 'open' }
+  })
+})
diff --git a/src/shared/sidebar-list/workspace-review-facts.ts b/src/shared/sidebar-list/workspace-review-facts.ts
new file mode 100644
index 00000000000..56806f0e4f3
--- /dev/null
+++ b/src/shared/sidebar-list/workspace-review-facts.ts
@@ -0,0 +1,76 @@
+import { z } from 'zod'
+import type { Repo } from '../repo-types'
+import type { Worktree } from '../worktree/types'
+import { getGitHubPRCacheKeyCandidates } from '../github/github-cache-key'
+import { isGitHubPRSuppressed } from '../worktree/github-pr-suppression'
+import { getPRGroupKeyForState, type PRGroupKey } from '../workspace-view/workspace-pr-groups'
+
+/** Grouping by PR reads GitHub PRs only, so only a row with a GitHub PR carries a fact. */
+const WorkspaceReviewFactSchema = z.object({
+  provider: z.literal('github'),
+  reviewState: z.string()
+})
+
+/** Read on demand, so it carries no revision. An absent id has no PR. */
+export const WorkspaceReviewFactsSnapshotSchema = z.object({
+  facts: z.record(z.string(), WorkspaceReviewFactSchema)
+})
+
+export type WorkspaceReviewFact = z.infer<typeof WorkspaceReviewFactSchema>
+export type WorkspaceReviewFactsSnapshot = z.infer<typeof WorkspaceReviewFactsSnapshotSchema>
+
+/** The window's PR cache, or main's persisted copy of it. */
+export type PRCacheView = Readonly<
+  Record<string, { data: { number?: number; state?: string } | null } | undefined>
+>
+
+/** A worktree's PR as the cache holds it, minus a PR the user unlinked. */
+export function readWorkspaceReviewFact(
+  worktree: Pick<Worktree, 'branch' | 'linkedPR' | 'suppressedGitHubPR'>,
+  repo: Pick<Repo, 'id' | 'path' | 'connectionId' | 'executionHostId'> | undefined,
+  prCache: PRCacheView
+): WorkspaceReviewFact | null {
+  const branch = worktree.branch.replace(/^refs\/heads\//, '')
+  if (!repo || !branch) {
+    return null
+  }
+  const keys = getGitHubPRCacheKeyCandidates(repo, branch)
+  // Why: legacy keys carry no host, so only a local repo may read them.
+  const lookup = !repo.connectionId && !repo.executionHostId ? keys : keys.slice(0, 1)
+  const entry = lookup.map((key) => prCache[key]).find((candidate) => candidate != null)
+  const pr = entry?.data
+  if (!pr || (typeof pr.number === 'number' && isGitHubPRSuppressed(worktree, pr.number))) {
+    return null
+  }
+  return { provider: 'github', reviewState: pr.state ?? '' }
+}
+
+export function prGroupOfReviewFact(fact: WorkspaceReviewFact | null | undefined): PRGroupKey {
+  return fact ? getPRGroupKeyForState(fact.reviewState) : 'in-progress'
+}
+
+export function workspaceReviewFactsEqual(
+  a: WorkspaceReviewFact | null | undefined,
+  b: WorkspaceReviewFact | null | undefined
+): boolean {
+  return a?.provider === b?.provider && a?.reviewState === b?.reviewState
+}
+
+/** Facts for every worktree with a PR; the window and main run this over their own copies. */
+export function buildWorkspaceReviewFacts(
+  worktrees: Iterable<
+    Pick<Worktree, 'id' | 'repoId' | 'branch' | 'linkedPR' | 'suppressedGitHubPR'>
+  >,
+  repos: Iterable<Pick<Repo, 'id' | 'path' | 'connectionId' | 'executionHostId'>>,
+  prCache: PRCacheView
+): Record<string, WorkspaceReviewFact> {
+  const repoById = new Map([...repos].map((repo) => [repo.id, repo]))
+  const facts: Record<string, WorkspaceReviewFact> = {}
+  for (const worktree of worktrees) {
+    const fact = readWorkspaceReviewFact(worktree, repoById.get(worktree.repoId), prCache)
+    if (fact) {
+      facts[worktree.id] = fact
+    }
+  }
+  return facts
+}
diff --git a/tests/e2e/sidebar-review-facts.spec.ts b/tests/e2e/sidebar-review-facts.spec.ts
new file mode 100644
index 00000000000..4ac1c7ec9a6
--- /dev/null
+++ b/tests/e2e/sidebar-review-facts.spec.ts
@@ -0,0 +1,65 @@
+import type { Page } from '@stablyai/playwright-test'
+import { test, expect } from './helpers/orca-app'
+import { expectNoSidebarShadowMismatches } from './helpers/sidebar-shadow'
+import { waitForActiveWorktree, waitForSessionReady } from './helpers/store'
+import { WorkspaceReviewFactsSnapshotSchema } from '../../src/shared/sidebar-list/workspace-review-facts'
+
+/** Writes a PR into the window's cache the way a fetch result lands; returns the row's id. */
+async function setWindowPRState(page: Page, state: 'open' | 'merged' | null): Promise<string> {
+  return page.evaluate((state) => {
+    const store = window.__store
+    if (!store) {
+      throw new Error('window.__store is not available')
+    }
+    const current = store.getState()
+    const worktree = Object.values(current.worktreesByRepo)
+      .flat()
+      .find((entry) => entry.branch.replace(/^refs\/heads\//, '') === 'e2e-secondary')
+    if (!worktree) {
+      throw new Error('seeded e2e-secondary worktree not found')
+    }
+    const key = `${worktree.repoId}::e2e-secondary`
+    const pr = state && {
+      number: 81,
+      title: 'Review facts from E2E',
+      state,
+      url: 'https://github.com/acme/orca/pull/81',
+      checksStatus: 'pending' as const,
+      updatedAt: '2026-10-17T00:00:00.000Z',
+      mergeable: 'UNKNOWN' as const
+    }
+    store.setState({ prCache: { ...current.prCache, [key]: { data: pr, fetchedAt: Date.now() } } })
+    return worktree.id
+  }, state)
+}
+
+async function readMainReviewFact(page: Page, worktreeId: string): Promise<unknown> {
+  const response = await page.evaluate(() =>
+    window.api.runtime.call({ method: 'sidebarInputs.reviewFacts' })
+  )
+  if (!response.ok) {
+    throw new Error('sidebarInputs.reviewFacts failed')
+  }
+  return WorkspaceReviewFactsSnapshotSchema.parse(response.result).facts[worktreeId] ?? null
+}
+
+test('main follows the window PR cache for each workspace', async ({ orcaPage }) => {
+  await waitForSessionReady(orcaPage)
+  await waitForActiveWorktree(orcaPage)
+
+  const worktreeId = await setWindowPRState(orcaPage, 'open')
+  // The window mirrors its cache to main within a second of a change.
+  await expect
+    .poll(() => readMainReviewFact(orcaPage, worktreeId), { timeout: 5_000 })
+    .toEqual({ provider: 'github', reviewState: 'open' })
+
+  await setWindowPRState(orcaPage, 'merged')
+  await expect
+    .poll(() => readMainReviewFact(orcaPage, worktreeId), { timeout: 5_000 })
+    .toEqual({ provider: 'github', reviewState: 'merged' })
+  await expectNoSidebarShadowMismatches(orcaPage)
+
+  await setWindowPRState(orcaPage, null)
+  await expect.poll(() => readMainReviewFact(orcaPage, worktreeId), { timeout: 5_000 }).toBeNull()
+  await expectNoSidebarShadowMismatches(orcaPage)
+})