kdlQuoteAlways only escaped \ and ", producing invalid KDL when CLI help text contained newlines, tabs, or carriage returns.

Changes

• integrations/cobra/kdl.go: Add \n, \t, \r escaping to kdlQuoteAlways, after the backslash escape to prevent double-escaping

• integrations/cobra/cobra_usage_test.go: Add TestSpecialCharacterEscaping (unit tests on kdlQuoteAlways directly), TestNewlineInCommandHelp, and TestSpecialCharsInFlagHelp

Example

// Input: cobra command with multiline Long description
cmd := &cobra.Command{
    Long: "First line.\nSecond line.\n\nThird paragraph.",
}

// Before: produced invalid KDL with literal newlines
long_about "First line.
Second line.

Third paragraph."

// After: correctly escaped
long_about "First line.\nSecond line.\n\nThird paragraph."

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