Fix claude-code chat participant registration error

[Copilot]

Extension unconditionally called createChatParticipant for claude-code session type, but package.json has a when clause that conditionally registers it. When the config is disabled, VS Code throws "chatParticipant must be declared in package.json".

Changes

• chatSessions.ts: Guard claude-code participant registration with config check

  const claudeCodeEnabled = vscode.workspace.getConfiguration('github.copilot.chat.claudeCode').get<boolean>('enabled', false);
  if (claudeCodeEnabled) {
      // register claude-code participant...
  }

• package.json: Fix when clause to use correct setting path

  • Was: config.github.copilot.chat.advanced.claudeCode.enabled (doesn't exist)
  • Now: config.github.copilot.chat.claudeCode.enabled (matches actual setting)

Original prompt

Fix microsoft/vscode#273855 from this extension's side (specifically claude). I suspect it's due to the fact that we call the createChatParticipant even though the when clause means that we don't active it on the vscode side? Not sure - figure it out please

The user has attached the following file paths as relevant context:

• .github/copilot-instructions.md

Created from VS Code.

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