Ignore io.WriteString results in Format

[danieljustus]

Assign io.WriteString's return values to blank identifiers in Untrusted.Format to explicitly ignore them. This silences linters/tools (e.g., errcheck) that flag unchecked return values when writing the fixed string.

What

Describe the change in a few sentences.

Why

Explain the problem, user need, or maintenance reason.

Testing

• make fmt
• make vet
• make lint
• GOWORK=off go test ./...
• Added or updated tests where needed

Safety

• I did not include passwords, tokens, private keys, vault contents, or personal data
• Documentation was updated where behavior changed

[Copilot]

Pull request overview

This PR updates the Untrusted.Format implementation used in passlint analysistest data to explicitly ignore io.WriteString return values, preventing linters (e.g., errcheck) from flagging the call as unchecked.

Changes:

• Assign io.WriteString’s (int, error) return values to blank identifiers in Untrusted.Format to make the intentional ignore explicit.

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