Macro sequence 

sequence!() { /* proc-macro */ }

Define sequence constants with rich metadata.

Supports all 5 metadata fields in any order:

• description - Human-readable description
• typical_severity - Typical severity level
• hints - Array of helpful hints
• related - Array of related sequences
• introduced - Version introduced

Examples

sequence! {
    MISSING(001),            // Simple
    CUSTOM(042) {            // With metadata
        description: "Custom logic error",
        hints: ["Check business rules", "Verify input"],
        related: ["043", "044"],
        introduced: "1.2.0",
    },
}