diff --git a/.papercuts/troubleshooting.md b/.papercuts/troubleshooting.md
index 3d86e417..59e94c45 100644
--- a/.papercuts/troubleshooting.md
+++ b/.papercuts/troubleshooting.md
@@ -430,6 +430,13 @@ symlink with this checkout's own npm ci. Full type-check and lint then passed.
 - E2E chat-title expectations assume the deterministic chat-model route. On a Mac where the native Foundation Models helper reports `ready`, automatic titles come from Apple Intelligence instead, so `chat-message-queue` sidebar-title lookups fail locally while passing in CI; probe the helper or move it aside before treating those failures as regressions.
 - `git add` on the tracked-but-ignored `.papercuts/troubleshooting.md` still needs `-f` after conflict resolution.
 
+## 2026-09-12 — Production provider-failure investigation
+
+- The 0.40.0 production diagnostic log collapsed a concrete OpenCode Go 400 into duplicate `unknown` generation failures; correlate the Pi journal to recover historical provider causes. PR #110 improves future evidence but cannot reconstruct old redacted logs.
+- A renderer exception during final streaming can detach a generation and miss its one-shot terminal payload. The durable run and chat settle correctly, but `chats:settled`/authoritative refetch does not clear the retained detached-stream owner, leaving “Response continues in the background…” and the sidebar activity ring until the renderer restarts.
+- A parallel read-only diagnostic command used a stale worktree path and failed before inspection; validate the active checkout path before dispatching concurrent repository reads.
+- The repository script is `npm run type-check`, not the common `typecheck` spelling; inspect `package.json` before chaining validation commands so a typo does not skip later linting.
+
 ## 2026-09-13 — GitHub PR checks sidebar dev launch
 
 - `npm ci` completed successfully but left `node_modules/electron/dist/Electron.app` absent; restore the macOS payload with `node node_modules/electron/install.js` before running `npm run dev`.
diff --git a/renderer/lib/chat-terminal-sync.test.ts b/renderer/lib/chat-terminal-sync.test.ts
index 6120e5f3..5314ee9c 100644
--- a/renderer/lib/chat-terminal-sync.test.ts
+++ b/renderer/lib/chat-terminal-sync.test.ts
@@ -1,12 +1,15 @@
 import assert from "node:assert/strict";
 import test from "node:test";
 import {
+  captureDetachedLifecycleChat,
+  clearInactiveDetachedLifecycleChat,
   detachedLifecycleChatProjection,
   detachedTextStreamingRemaining,
   fallbackDetachedLifecycleStream,
   isDetachedLifecycleChatDraining,
   parseChatReadResponse,
   parseChatSettlementNotification,
+  pendingDetachedLifecycleChats,
   preferLatestTerminalChat,
   reconcileChatReadUntilAuthoritative,
   rememberChatReadReconciliation,
@@ -496,6 +499,57 @@ test("a provisional stale read survives a missed settlement event until authorit
   unsubscribe();
 });
 
+test("an inactive snapshot repairs a missed terminal without clearing active work", () => {
+  const staleOwner = detached("missed-terminal", "chat-missed-terminal", "workspace-1");
+  const activeOwner = detached("still-running", "chat-still-running", "workspace-1");
+  rememberDetachedLifecycleStream(staleOwner, {
+    content: "Durable response that outlived the route",
+    reasoning: "",
+    timeline: null,
+    artifacts: [],
+    subagents: [],
+  });
+  rememberDetachedLifecycleStream(activeOwner);
+
+  assert.deepEqual(pendingDetachedLifecycleChats(), [
+    { chatId: staleOwner.chatId, workspaceId: staleOwner.workspaceId, streamIds: [staleOwner.streamId] },
+    { chatId: activeOwner.chatId, workspaceId: activeOwner.workspaceId, streamIds: [activeOwner.streamId] },
+  ]);
+  const staleTarget = captureDetachedLifecycleChat(staleOwner);
+  const activeTarget = captureDetachedLifecycleChat(activeOwner);
+  assert.ok(staleTarget);
+  assert.ok(activeTarget);
+  const activeChatIds = new Set([activeOwner.chatId]);
+  assert.equal(clearInactiveDetachedLifecycleChat(activeTarget, activeChatIds), false);
+  assert.equal(isDetachedLifecycleChatDraining(activeOwner.chatId, activeOwner.workspaceId), true);
+  assert.equal(clearInactiveDetachedLifecycleChat(staleTarget, activeChatIds), true);
+  assert.equal(detachedLifecycleChatProjection(staleOwner.chatId, staleOwner.workspaceId), null);
+  assert.equal(isDetachedLifecycleChatDraining(staleOwner.chatId, staleOwner.workspaceId), false);
+  assert.equal(clearInactiveDetachedLifecycleChat(activeTarget, new Set()), true);
+});
+
+test("authoritative recovery is stream-exact when newer work starts in the same chat", () => {
+  const owner = detached("fallback-missed", "chat-fallback-missed", "workspace-1");
+  rememberDetachedLifecycleStream(owner);
+  assert.equal(fallbackDetachedLifecycleStream(owner.streamId), true);
+  const captured = captureDetachedLifecycleChat(owner);
+  assert.ok(captured);
+
+  const newerOwner = detached("newer-detached-work", owner.chatId, owner.workspaceId);
+  rememberDetachedLifecycleStream(newerOwner);
+  rememberDetachedLifecycleStream(detached("other-workspace", owner.chatId, "workspace-2"));
+  assert.equal(clearInactiveDetachedLifecycleChat(captured, new Set()), true);
+  assert.equal(isDetachedLifecycleChatDraining(owner.chatId, owner.workspaceId), true);
+  assert.equal(isDetachedLifecycleChatDraining(owner.chatId, "workspace-2"), true);
+
+  const newerTarget = captureDetachedLifecycleChat(newerOwner);
+  const otherTarget = captureDetachedLifecycleChat({ chatId: owner.chatId, workspaceId: "workspace-2" });
+  assert.ok(newerTarget);
+  assert.ok(otherTarget);
+  assert.equal(clearInactiveDetachedLifecycleChat(newerTarget, new Set()), true);
+  assert.equal(clearInactiveDetachedLifecycleChat(otherTarget, new Set()), true);
+});
+
 test("chat read reconciliation metadata is bounded, content-free, and owner-bound", () => {
   const stale = chat("chat-a", "stale transcript remains only inside chat");
   assert.deepEqual(
diff --git a/renderer/lib/chat-terminal-sync.ts b/renderer/lib/chat-terminal-sync.ts
index 8ba36b41..9760577f 100644
--- a/renderer/lib/chat-terminal-sync.ts
+++ b/renderer/lib/chat-terminal-sync.ts
@@ -59,6 +59,10 @@ export interface ChatSettlementNotification {
   workspaceId: string;
 }
 
+export interface DetachedLifecycleChatReconciliation extends ChatSettlementNotification {
+  streamIds: readonly string[];
+}
+
 export interface ChatReadReconciliation {
   chatId: string;
   workspaceId: string;
@@ -349,6 +353,80 @@ export function isDetachedLifecycleChatDraining(
   );
 }
 
+function ownsLifecycleChat(
+  owner: ChatSettlementNotification,
+  chatId: string,
+  workspaceId: string,
+): boolean {
+  return owner.chatId === chatId && owner.workspaceId === workspaceId;
+}
+
+/** Capture exact retained streams so recovery cannot clear newer work in the same chat. */
+export function pendingDetachedLifecycleChats(): DetachedLifecycleChatReconciliation[] {
+  const pending = new Map<string, DetachedLifecycleChatReconciliation>();
+  for (const [streamId, owner] of [
+    ...detachedLifecycleStreams.entries(),
+    ...fallbackLifecycleStreams.entries(),
+  ]) {
+    const key = chatReadReconciliationKey(owner);
+    const retained = pending.get(key);
+    if (retained?.streamIds.includes(streamId)) continue;
+    pending.set(key, {
+      chatId: owner.chatId,
+      workspaceId: owner.workspaceId,
+      streamIds: [...(retained?.streamIds ?? []), streamId],
+    });
+  }
+  return [...pending.values()];
+}
+
+export function captureDetachedLifecycleChat(
+  owner: ChatSettlementNotification,
+): DetachedLifecycleChatReconciliation | null {
+  const workspaceId = persistedChatWorkspaceId(owner.workspaceId);
+  return (
+    pendingDetachedLifecycleChats().find((candidate) =>
+      ownsLifecycleChat(candidate, owner.chatId, workspaceId),
+    ) ?? null
+  );
+}
+
+/** Clear captured ownership only after main's current activity snapshot proves inactivity. */
+export function clearInactiveDetachedLifecycleChat(
+  owner: DetachedLifecycleChatReconciliation,
+  activeChatIds: ReadonlySet<string>,
+): boolean {
+  if (
+    !isSafeSubagentIdentifier(owner.chatId) ||
+    !isSafeSubagentIdentifier(owner.workspaceId) ||
+    !owner.streamIds.every(isSafeSubagentIdentifier) ||
+    activeChatIds.has(owner.chatId)
+  ) {
+    return false;
+  }
+  const workspaceId = persistedChatWorkspaceId(owner.workspaceId);
+  let changed = false;
+  for (const streamId of owner.streamIds) {
+    const detachedOwner = detachedLifecycleStreams.get(streamId);
+    if (detachedOwner && ownsLifecycleChat(detachedOwner, owner.chatId, workspaceId)) {
+      detachedLifecycleStreams.delete(streamId);
+      changed = true;
+    }
+    const fallbackOwner = fallbackLifecycleStreams.get(streamId);
+    if (fallbackOwner && ownsLifecycleChat(fallbackOwner, owner.chatId, workspaceId)) {
+      fallbackLifecycleStreams.delete(streamId);
+      changed = true;
+    }
+    const projection = detachedLifecycleProjections.get(streamId);
+    if (projection && ownsLifecycleChat(projection, owner.chatId, workspaceId)) {
+      detachedLifecycleProjections.delete(streamId);
+      changed = true;
+    }
+  }
+  if (changed) emitRegistryChange();
+  return changed;
+}
+
 function requestChatReadReconciliation(owner: ChatReadReconciliation): void {
   const key = chatReadReconciliationKey(owner);
   if (
diff --git a/renderer/main/chat-transition.test.tsx b/renderer/main/chat-transition.test.tsx
index 7a590735..38d8ffe3 100644
--- a/renderer/main/chat-transition.test.tsx
+++ b/renderer/main/chat-transition.test.tsx
@@ -317,6 +317,25 @@ test("a revisited detached stream restores the responding window from its last t
   );
 });
 
+test("root recovery reconciles missed detached terminals against authoritative activity", () => {
+  const root = source("./root-view.tsx");
+  const recovery = between(
+    root,
+    "const reconcileInactiveOwners = (payload: unknown) => {",
+    "}, [reconcileDetachedLifecycleChat]);",
+  );
+  assert.match(recovery, /parseChatActivitySnapshot\(payload\)/u);
+  assert.match(recovery, /pendingDetachedLifecycleChats\(\)/u);
+  assert.match(recovery, /!activeChatIds\.has\(owner\.chatId\)/u);
+  assert.ok(
+    recovery.indexOf('onNotification("chats:activity-changed"') < recovery.indexOf(".activitySnapshot()"),
+    "Recovery must subscribe before its bootstrap snapshot",
+  );
+  assert.match(root, /captureDetachedLifecycleChat\(owner\)/u);
+  assert.match(root, /clearInactiveDetachedLifecycleChat\(captured, new Set\(snapshot\.activeChatIds\)\)/u);
+  assert.match(root, /subscribeChatSettlements[\s\S]{0,180}reconcileDetachedLifecycleChat\(settlement\)/u);
+});
+
 test("every ordinary new-agent entry opens a draft without eager creation", () => {
   for (const file of ["./chat-layout.tsx", "./root-view.tsx", "./chat-pane.tsx", "../components/chat-sidebar.tsx"]) {
     const implementation = source(file);
diff --git a/renderer/main/root-view.tsx b/renderer/main/root-view.tsx
index 553c113a..566f68e9 100644
--- a/renderer/main/root-view.tsx
+++ b/renderer/main/root-view.tsx
@@ -19,12 +19,17 @@ import { AppCommandPalette } from "../components/command-palette";
 import { OnboardingFlow } from "../components/onboarding-flow";
 import { workspaceCommandVisibility } from "../lib/command-system-core";
 import {
+  captureDetachedLifecycleChat,
+  clearInactiveDetachedLifecycleChat,
+  type DetachedLifecycleChatReconciliation,
+  pendingDetachedLifecycleChats,
   preferLatestTerminalChat,
   reconcileChatReadUntilAuthoritative,
   subscribeChatReadReconciliations,
   subscribeChatSettlements,
   subscribeDetachedTerminalChats,
 } from "../lib/chat-terminal-sync";
+import { parseChatActivitySnapshot } from "../shared/chat-activity";
 import { isChatCacheDeleted } from "../lib/chat-deletion-cache";
 import type { Chat } from "../lib/types";
 import { useAppendReconciliationRequired } from "../lib/append-reconciliation";
@@ -96,6 +101,26 @@ function RootContent() {
     },
     [queryClient],
   );
+  const reconcileDetachedLifecycleChat = React.useCallback(
+    (
+      owner:
+        | { chatId: string; workspaceId: string }
+        | DetachedLifecycleChatReconciliation,
+    ) => {
+      const captured = "streamIds" in owner ? owner : captureDetachedLifecycleChat(owner);
+      return (async () => {
+        try {
+          await reconcileChatCacheAfterIdle(owner.chatId);
+          const snapshot = parseChatActivitySnapshot(await chatsApi.activitySnapshot());
+          if (!snapshot || !captured) return;
+          clearInactiveDetachedLifecycleChat(captured, new Set(snapshot.activeChatIds));
+        } catch {
+          // Failure is not proof of settlement. Retained activity events retry it.
+        }
+      })();
+    },
+    [reconcileChatCacheAfterIdle],
+  );
 
   useCommandHandler(
     "terminal.toggle",
@@ -255,12 +280,37 @@ function RootContent() {
   React.useEffect(
     () =>
       subscribeChatSettlements(onNotification, (settlement) => {
-        if (isChatCacheDeleted(settlement.chatId)) return;
-        void reconcileChatCacheAfterIdle(settlement.chatId);
+        void reconcileDetachedLifecycleChat(settlement);
       }),
-    [reconcileChatCacheAfterIdle],
+    [reconcileDetachedLifecycleChat],
   );
 
+  React.useEffect(() => {
+    let disposed = false;
+    const reconcileInactiveOwners = (payload: unknown) => {
+      const snapshot = parseChatActivitySnapshot(payload);
+      if (!snapshot) return;
+      const activeChatIds = new Set(snapshot.activeChatIds);
+      for (const owner of pendingDetachedLifecycleChats()) {
+        if (!activeChatIds.has(owner.chatId)) void reconcileDetachedLifecycleChat(owner);
+      }
+    };
+    // Subscribe before the bootstrap snapshot so no transition falls in between.
+    const unsubscribe = onNotification("chats:activity-changed", reconcileInactiveOwners);
+    void chatsApi
+      .activitySnapshot()
+      .then((payload) => {
+        if (!disposed) reconcileInactiveOwners(payload);
+      })
+      .catch(() => {
+        // Future activity or settlement events retry recovery.
+      });
+    return () => {
+      disposed = true;
+      unsubscribe();
+    };
+  }, [reconcileDetachedLifecycleChat]);
+
   React.useEffect(() => {
     // ~/.aiden/config.json was edited outside the app. Only the lists sourced
     // from the portable file are stale; workspaces and UI settings are stored