Fix gosimple S1008 linter violation in update_check.go

[Copilot]

The lint-go workflow failed due to golangci-lint v1.62.2 flagging an unnecessarily verbose if-else return pattern in isRunningAsMCPServer().

Changes

• Simplified boolean return logic in pkg/cli/update_check.go to satisfy gosimple linter rule S1008

Before:

if os.Getenv("GH_AW_MCP_SERVER") != "" {
    return true
}
return false

After:

return os.Getenv("GH_AW_MCP_SERVER") != ""

The simplified version is semantically identical and more idiomatic Go.

Original prompt

Fix the failing GitHub Actions workflow lint-go

Analyze the workflow logs, identify the root cause of the failure, and implement a fix.

Job ID: 58615949052

Job URL: https://github.com/githubnext/gh-aw/actions/runs/20397880814/job/58615949052

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