test(app): retain Android workspace memory diagnostic

Preserve the device assertion for a supplemental LOW_MEMORY exit seen with 800 projects. This does not establish the cause of the cold-start ANR reported in #4408 and changes no production behavior.

packages/app/e2e/mobile/workspace-memory/README.md

@@ -0,0 +1,21 @@
+# Android workspace memory diagnostic
+
+Supplemental reproduction for [#4408](https://github.com/getpaseo/paseo/issues/4408), using the production 0.11.2 APK on an Android 16 emulator. This tests an adapted failure: opening the sidebar with 800 projects, each containing one workspace, produced a `LOW_MEMORY` exit after 66–90 seconds. It does not reproduce the reported 18-second cold-start ANR or establish its cause.
+
+Before running:
+
+- Use a dedicated emulator with the production APK installed and notifications permission settled. Bind the agent-device session to that emulator before running.
+- Pair the app with an isolated daemon containing 800 active workspaces, each in its own project. Use Project grouping and leave projects expanded. The observed fixture used existing directories inside a Git checkout, with workspace titles permuted by `(index * 317) % 800`, no agents, and no terminals.
+- Record the daemon revision, emulator RAM and Java heap settings, and the project/workspace distribution. Device memory pressure controls whether Android kills the app.
+
+Run from the repository root with the agent-device session, Android serial, and an artifact directory:
+
+```sh
+node packages/app/e2e/mobile/workspace-memory/android.mjs workspace-memory emulator-5556 .dev/workspace-memory
+```
+
+The test cold-starts the paired app, opens its sidebar, samples memory and the process ID every five seconds for two minutes, and verifies that closing the sidebar responds. A process exit or restart fails the assertion. Memory, exit records, and logs stay in the supplied artifact directory.
+
+Control: repeat with 800 workspaces grouped into one project. That distribution survived the two-minute automated check and responded to closing the sidebar, with total PSS near 300 MB. The project-per-workspace fixture reached about 2.5 GB PSS before Android recorded `LOW_MEMORY`; its Java heap rose and fell rather than showing the reporter's full-heap ANR. Neither result proves that shared collators would fix the report.
+
+This diagnostic is deliberately outside CI and contains no production change.

packages/app/e2e/mobile/workspace-memory/android.mjs

@@ -0,0 +1,65 @@
+// Requires a paired production app and the workspace fixture described in README.md.
+import assert from "node:assert/strict";
+import { execFileSync } from "node:child_process";
+import { mkdirSync, writeFileSync } from "node:fs";
+import { join } from "node:path";
+import { setTimeout as delay } from "node:timers/promises";
+
+const [, , session, serial, artifacts] = process.argv;
+assert(session && serial && artifacts, "Pass session, Android serial, and artifact directory");
+mkdirSync(artifacts, { recursive: true });
+
+function ad(...args) {
+  return execFileSync("agent-device", [...args, "--session", session], {
+    encoding: "utf8",
+    timeout: 60_000,
+  });
+}
+function adb(...args) {
+  return execFileSync("adb", ["-s", serial, ...args], {
+    encoding: "utf8",
+    timeout: 15_000,
+  });
+}
+function pid() {
+  try {
+    return adb("shell", "pidof", "sh.paseo").trim();
+  } catch {
+    return "";
+  }
+}
+
+ad("open", "sh.paseo", "--relaunch", "--platform", "android");
+ad("wait", "text", "Open menu", "15000");
+assert.equal(
+  JSON.parse(ad("perf", "memory", "sample", "--json")).data.deviceId,
+  serial,
+  "Session and adb serial must address the same device",
+);
+const initialPid = pid();
+assert(initialPid, "App must have a process before opening the sidebar");
+ad("press", 'label="Open menu"', "--settle");
+const startedAt = Date.now();
+const samples = [];
+try {
+  while (Date.now() - startedAt < 120_000) {
+    const currentPid = pid();
+    samples.push({
+      elapsedMs: Date.now() - startedAt,
+      pid: currentPid,
+      meminfo: currentPid ? adb("shell", "dumpsys", "meminfo", "sh.paseo") : "",
+    });
+    writeFileSync(join(artifacts, "samples.json"), JSON.stringify(samples, null, 2));
+    assert.equal(currentPid, initialPid, "Opening the workspace sidebar must keep the app alive");
+    await delay(5_000);
+  }
+  ad("press", 'label="Close sidebar"', "--settle");
+  ad("wait", "text", "Open menu", "10000");
+  console.log("PASS: app survived two minutes with the sidebar open and responded to Close");
+} finally {
+  writeFileSync(
+    join(artifacts, "exit-info.txt"),
+    adb("shell", "dumpsys", "activity", "exit-info", "sh.paseo"),
+  );
+  writeFileSync(join(artifacts, "logcat.txt"), adb("logcat", "-d", "-t", "4000"));
+}

packages/server/src/server/agent/providers/pi/agent.test.ts

@@ -1943,6 +1943,48 @@ describe("PiRpcAgentSession", () => {
     expect(session.describePersistence()?.metadata?.thinkingOptionId).toBe("off");
   });
 
+  test.each(["high", "off", "max"] as const)(
+    "publishes an extension's thinking change to %s before refreshing state",
+    async (level) => {
+      const { pi, session } = await createSession();
+      onTestFinished(() => session.close());
+      const changes: AgentStreamEvent[] = [];
+      session.subscribe((event) => {
+        if (event.type === "thinking_option_changed") {
+          expect(session.describePersistence()?.metadata?.thinkingOptionId).toBe(level);
+          changes.push(event);
+        }
+      });
+      const runtime = pi.latestSession();
+      runtime.state = { ...runtime.state, thinkingLevel: level };
+      runtime.emit({ type: "thinking_level_changed", level });
+
+      expect(changes).toEqual([
+        { type: "thinking_option_changed", provider: "pi", thinkingOptionId: level },
+      ]);
+      expect(session.describePersistence()?.metadata?.thinkingOptionId).toBe(level);
+      await expect(session.getRuntimeInfo()).resolves.toMatchObject({ thinkingOptionId: level });
+    },
+  );
+
+  test.each([undefined, null, "invalid", 123])(
+    "ignores a thinking change with invalid level %s",
+    async (level) => {
+      const { pi, session } = await createSession();
+      onTestFinished(() => session.close());
+      const initialThinking = session.describePersistence()?.metadata?.thinkingOptionId;
+      const changes: AgentStreamEvent[] = [];
+      session.subscribe((event) => {
+        if (event.type === "thinking_option_changed") changes.push(event);
+      });
+
+      pi.latestSession().emit({ type: "thinking_level_changed", level });
+
+      expect(changes).toEqual([]);
+      expect(session.describePersistence()?.metadata?.thinkingOptionId).toBe(initialThinking);
+    },
+  );
+
   test("surfaces state refresh failures after a Pi thinking update", async () => {
     const { pi, session } = await createSession();
     onTestFinished(() => session.close());

packages/server/src/server/agent/providers/pi/agent.ts

@@ -1005,6 +1005,8 @@ function isProcessExitEvent(
 
 function isPiAgentSessionEvent(event: PiRuntimeEvent): event is PiAgentSessionEvent {
   switch (event.type) {
+    case "thinking_level_changed":
+      return typeof event.level === "string" && normalizePiThinkingOption(event.level) !== null;
     case "agent_start":
     case "turn_start":
     case "message_start":
@@ -2136,6 +2138,15 @@ export class PiRpcAgentSession implements AgentSession {
     }
 
     switch (event.type) {
+      case "thinking_level_changed":
+        this.state = { ...this.state, thinkingLevel: event.level };
+        this.config.thinkingOptionId = event.level;
+        this.emit({
+          type: "thinking_option_changed",
+          provider: this.provider,
+          thinkingOptionId: event.level,
+        });
+        return;
       case "agent_start":
         this.activeTurnStarted = true;
         this.clearNoTurnBuffers();

packages/server/src/server/agent/providers/pi/rpc-types.ts

@@ -160,6 +160,7 @@ export type PiAssistantMessageEvent =
   | { type: "start" | "text_start" | "text_end" | "thinking_start" | "thinking_end" | "done" };
 
 export type PiAgentSessionEvent =
+  | { type: "thinking_level_changed"; level: PiThinkingLevel }
   | { type: "agent_start" }
   | { type: "turn_start" }
   | { type: "message_start"; message: PiAgentMessage }