fix: errcheck findings from the guest merge

[NovusEdge]

main fails lint with four errcheck findings. #48 branched before #47 added the linter, so its code never met the gate. Every open dependabot PR inherits the failure.

• internal/guest/load.go: the bundled-guest temp file reports a failed Close or Remove instead of dropping it.
• internal/config/config_test.go: setup failures fail the test.

Tests run

• golangci-lint run ./...: 0 issues
• go test ./...

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📥 Commits

Reviewing files that changed from the base of the PR and between 3412c22 and 7fcc451.

📒 Files selected for processing (2)

• internal/config/config_test.go
• internal/guest/load.go

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