run shell path async to avoid blocking config load

[sestinj]

Description

getEnvPathFromUserShell was causing unresponsive extension host when loading MCP servers (stdio). Making it async solves this

Checklist

• I've read the contributing guide
• The relevant docs, if any, have been updated or created
• The relevant tests, if any, have been updated or created

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Summary by cubic

Loading the user shell PATH is now done asynchronously to prevent blocking the extension host during MCP server startup.

• Refactors
  • Replaced sync shell PATH loading with async calls in MCP connection setup.
  • Updated related utility to use async execution.

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[cubic-dev-ai]

cubic reviewed 2 files and found no issues. Review PR in cubic.dev.

[Patrick-Erichsen]

Nice catch!

[Patrick-Erichsen]

Tests seem to be failing on a valid problem:

 ❯ context/mcp/MCPConnection.vitest.ts:88:48
     86|       };
     87| 
     88|       expect(() => new MCPConnection(options)).toThrow(
       |                                                ^
     89|         "Unsupported transport type: invalid",
     90|       );

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[sestinj]

🎉 This PR is included in version 1.1.0 🎉

The release is available on:

• npm package (@latest dist-tag)
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