InMemoryRunner default appName should be "InMemoryRunner" to match adk-python

[mithun-sudo]

Description

InMemoryRunner(BaseAgent) currently defaults appName to agent.name().

In adk-python, the default is "InMemoryRunner" when no app_name is provided.

There is an explicit TODO in Java:
https://github.com/google/adk-java/blob/main/core/src/main/java/com/google/adk/runner/InMemoryRunner.java

Expected behavior

new InMemoryRunner(agent) should use appName = "InMemoryRunner".

Actual behavior

appName defaults to agent.name().

Impact

Callers using runAsync(userId, sessionId, ...) may fail to find sessions created under a different app name than the runner's implicit default.

Proposed fix

PR #1485

[hemasekhar-p]

Hi @mithun-sudo, Thank you for reporting this issue. we appreciate you taking the time to submit the PR. I am able to reproduce this behavior and I have added some comments to the PR. To proceed with review, could you please address them?

[hemasekhar-p]

@mithun-sudo, thank you for addressing the comments on PR. currently the issue and the PR are under review by our team and we will keep you posted if any further information is required.