[Bug]: AgentRun tar extract failed: tar: /home/agentscope/workspace: Cannot open: No such file or directory

error log :

```
15:13:24.400 [main] ERROR i.a.h.a.m.SandboxLifecycleMiddleware - [sandbox-mw] Failed to acquire/start sandbox
io.agentscope.harness.agent.sandbox.SandboxException$WorkspaceStartException: Failed to start workspace at: /workspace
at io.agentscope.harness.agent.sandbox.AbstractBaseSandbox.start(AbstractBaseSandbox.java:122)
at io.agentscope.extensions.sandbox.agentrun.AgentRunSandbox.start(AgentRunSandbox.java:74)
at io.agentscope.harness.agent.middleware.SandboxLifecycleMiddleware.acquireForCall(SandboxLifecycleMiddleware.java:110)
at io.agentscope.harness.agent.HarnessAgent.lambda$wrappedCall$0(HarnessAgent.java:797)
at reactor.core.publisher.MonoUsing.subscribe(MonoUsing.java:75)
at reactor.core.publisher.Mono.subscribe(Mono.java:4569)
at reactor.core.publisher.Mono.block(Mono.java:1772)
at io.agentscope.examples.documentation2.harness.memory.MemoryCompactionExample2.main(MemoryCompactionExample2.java:90)
Caused by: io.agentscope.harness.agent.sandbox.SandboxException$SandboxRuntimeException: AgentRun tar extract failed: tar: /home/agentscope/workspace: Cannot open: No such file or directory
tar: Error is not recoverable: exiting now
Traceback (most recent call last):
File "", line 1, in
File "/usr/local/lib/python3.12/subprocess.py", line 571, in run
raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['tar', 'xf', '-', '-C', '/home/agentscope/workspace']' returned non-zero exit status 2.

at io.agentscope.extensions.sandbox.agentrun.AgentRunSandbox.doHydrateWorkspace(AgentRunSandbox.java:182)
at io.agentscope.harness.agent.sandbox.AbstractBaseSandbox.applyWorkspaceProjectionIfChanged(AbstractBaseSandbox.java:279)
at io.agentscope.harness.agent.sandbox.AbstractBaseSandbox.start(AbstractBaseSandbox.java:116)
... 7 common frames omitted
```