fix(intellij): IdeProtocalClient handleMessage subprocess

[nangua]

Description

Logs output:

Unknown message type: subprocess

Checklist

• The relevant docs, if any, have been updated or created
• The relevant tests, if any, have been updated or created

Screenshots

Not involved.

Testing instructions

Not involved.

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[sestinj]

@nangua I think we are going to probably deprecate this message soon along with config.ts. I assume you are using config.ts, but could you share what your use case is for "subprocess"?

[sestinj]

@nangua I've not heard back so I'm going to close this PR. If you want to continue the conversation, please feel free to open an issue!

[nangua]

@sestinj Yes, I am indeed using config. ts，I read the official doc Custom Context Providers with Submenu or Query, which claims that ide. subprocess can be used in the Custom Context Provider. However, I happened to need to use some lightweight MCP like logic in the provider that also requires interaction with the operating system through ide. subprocess, so I used it.

For example, I need to analyze the risk of dependency components in Maven projects. In order to reduce tokens, I hope to first generate a list of dependency components for the entire project through mvn dependency:list in the Custom Context Provider, and then parse it into a compact string in getContextitems(). Although there may be other more elegant solutions, I believe the current approach is the most convenient.