test(pi-claude-cli): cover async CLI validation probes

Adds vitest coverage for validateCliPresenceAsync and validateCliAuthAsync,
verifying success paths, spawn-error paths, non-zero exit codes, and that
auth failures emit the expected warning. Pairs with the async/memoized
validation refactor in f7df0d4e3 that unblocks the dashboard event loop
on every chat send.

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

.changeset/pi-claude-cli-async-validation.md

@@ -0,0 +1,5 @@
+---
+"@runfusion/fusion": patch
+---
+
+Stop blocking the Node event loop on every chat send. The pi-claude-cli extension factory used to run two `execSync` probes (`claude --version`, `claude auth status`) on every `createFnAgent` call, which Fusion invokes per chat message — so each send froze every other dashboard API for a few seconds while the Claude CLI cold-started. Probes now run async via `spawn` and are memoized to once per process.

packages/pi-claude-cli/src/__tests__/process-manager.test.ts

@@ -47,6 +47,8 @@ import {
   captureStderr,
   validateCliPresence,
   validateCliAuth,
+  validateCliPresenceAsync,
+  validateCliAuthAsync,
   forceKillProcess,
   registerProcess,
   killAllProcesses,
@@ -407,6 +409,94 @@ describe("validateCliAuth", () => {
   });
 });
 
+describe("validateCliPresenceAsync", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("resolves ok=true when claude --version exits 0", async () => {
+    const EventEmitter = require("node:events");
+    (spawn as any).mockImplementationOnce(() => {
+      const proc = new EventEmitter();
+      proc.kill = vi.fn();
+      setImmediate(() => proc.emit("exit", 0));
+      return proc;
+    });
+
+    const result = await validateCliPresenceAsync();
+    expect(result).toEqual({ ok: true });
+    const args = (spawn as any).mock.calls[0][1] as string[];
+    expect(args).toEqual(["--version"]);
+  });
+
+  it("resolves ok=false with install message when spawn errors", async () => {
+    const EventEmitter = require("node:events");
+    (spawn as any).mockImplementationOnce(() => {
+      const proc = new EventEmitter();
+      proc.kill = vi.fn();
+      setImmediate(() => proc.emit("error", new Error("ENOENT")));
+      return proc;
+    });
+
+    const result = await validateCliPresenceAsync();
+    expect(result.ok).toBe(false);
+    if (!result.ok) {
+      expect(result.error.message).toContain("Claude Code CLI not found");
+      expect(result.error.message).toContain("npm install");
+    }
+  });
+
+  it("resolves ok=false when claude --version exits non-zero", async () => {
+    const EventEmitter = require("node:events");
+    (spawn as any).mockImplementationOnce(() => {
+      const proc = new EventEmitter();
+      proc.kill = vi.fn();
+      setImmediate(() => proc.emit("exit", 1));
+      return proc;
+    });
+
+    const result = await validateCliPresenceAsync();
+    expect(result.ok).toBe(false);
+  });
+});
+
+describe("validateCliAuthAsync", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("resolves true when claude auth status exits 0", async () => {
+    const EventEmitter = require("node:events");
+    (spawn as any).mockImplementationOnce(() => {
+      const proc = new EventEmitter();
+      proc.kill = vi.fn();
+      setImmediate(() => proc.emit("exit", 0));
+      return proc;
+    });
+
+    expect(await validateCliAuthAsync()).toBe(true);
+    const args = (spawn as any).mock.calls[0][1] as string[];
+    expect(args).toEqual(["auth", "status"]);
+  });
+
+  it("resolves false and warns when claude auth status fails", async () => {
+    const EventEmitter = require("node:events");
+    (spawn as any).mockImplementationOnce(() => {
+      const proc = new EventEmitter();
+      proc.kill = vi.fn();
+      setImmediate(() => proc.emit("exit", 1));
+      return proc;
+    });
+    const warnSpy = vi.spyOn(console, "warn").mockImplementation(() => {});
+
+    expect(await validateCliAuthAsync()).toBe(false);
+    expect(warnSpy).toHaveBeenCalledWith(
+      expect.stringContaining("not authenticated"),
+    );
+    warnSpy.mockRestore();
+  });
+});
+
 describe("CLI flags", () => {
   beforeEach(() => {
     vi.clearAllMocks();