Attach an existing session to MCP

[rajivnw]

There should be a way to attach the existing session to MCP. It seems start_new_session command alway start a new session.
attaching an existing session can help to run the test from script/command line i.e. WDIO test runner and then handover to AI assistance or agent.

[netzulo]

I think this is proposed in #29 , check it and help me to make the PR be merged :)

[Winify]

Not quite, for an existing session to be attachable, its needs have an accessible sessionId

If it is not provided then a wdio session cannot be attached to an ongoing session

Additionally, a standard chrome session is not an automatable session, so it has no session id as well, it has to be started with remote-debugging, then it could be attached via capabilities

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The WDIO TEST runner already starts a session, but timeout could close the browser/session during the MCP commands

These are different use-cases, what is needed?