feat(desktop): add hot view retain/release lifecycle and process metrics

Replace single-shot acquireHotView with retainHotView/releaseHotView
plus a minute-level reaper that closes views idle beyond 5 minutes and
never evicts a view while it still has live retainers. Wrap adapter
calls in try/finally so a failing publish/query still releases the
view. Sample process metrics every minute and expose hot-view policy
and process snapshot via the runtime snapshot for diagnostics.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/desktop-client/src/main/runtime-controller.ts

@@ -27,7 +27,7 @@ import {
   normalizeAccountPlatformUid,
   sameAccountPlatformUid,
 } from "../shared/account-identity";
-import { acquireHotView } from "./view-pool";
+import { releaseHotView, retainHotView } from "./view-pool";
 import { getLeaseManagerSnapshot, noteLeaseExtended, noteLeaseReleased, setActiveLease } from "./lease-manager";
 import {
   initScheduler,
@@ -939,25 +939,29 @@ async function executeTaskAdapter(
     const viewHandle =
       adapter.executionMode === "session" || adapter.executionMode === "playwright"
         ? null
-        : acquireHotView(task.accountId || task.id);
+        : retainHotView(task.accountId || task.id);
 
-    const result = await adapter.publish(
-      {
-        taskId: task.id,
-        accountId: task.accountId || task.id,
-        session: sessionHandle.session,
-        view: viewHandle?.view ?? null,
-        signal,
-        phase: "initial",
-        article: await loadPublishArticle(task),
-        reportProgress(stage: string) {
-          updateTaskProgress(task.id, `publish adapter progress: ${stage}`);
+    try {
+      return await adapter.publish(
+        {
+          taskId: task.id,
+          accountId: task.accountId || task.id,
+          session: sessionHandle.session,
+          view: viewHandle?.view ?? null,
+          signal,
+          phase: "initial",
+          article: await loadPublishArticle(task),
+          reportProgress(stage: string) {
+            updateTaskProgress(task.id, `publish adapter progress: ${stage}`);
+          },
         },
-      },
-      payload,
-    );
-
-    return result;
+        payload,
+      );
+    } finally {
+      if (viewHandle) {
+        releaseHotView(viewHandle.accountId);
+      }
+    }
   }
 
   const adapter = selectMonitorAdapter(task.platform);
@@ -968,24 +972,28 @@ async function executeTaskAdapter(
   const viewHandle =
     adapter.executionMode === "session" || adapter.executionMode === "playwright"
       ? null
-      : acquireHotView(task.accountId || task.id);
+      : retainHotView(task.accountId || task.id);
 
-  const result = await adapter.query(
-    {
-      taskId: task.id,
-      accountId: task.accountId || task.id,
-      session: sessionHandle.session,
-      view: viewHandle?.view ?? null,
-      signal,
-      phase: "initial",
-      reportProgress(stage: string) {
-        updateTaskProgress(task.id, `monitor adapter progress: ${stage}`);
+  try {
+    return await adapter.query(
+      {
+        taskId: task.id,
+        accountId: task.accountId || task.id,
+        session: sessionHandle.session,
+        view: viewHandle?.view ?? null,
+        signal,
+        phase: "initial",
+        reportProgress(stage: string) {
+          updateTaskProgress(task.id, `monitor adapter progress: ${stage}`);
+        },
       },
-    },
-    payload,
-  );
-
-  return result;
+      payload,
+    );
+  } finally {
+    if (viewHandle) {
+      releaseHotView(viewHandle.accountId);
+    }
+  }
 }
 
 function buildScaffoldResult(