v3.0.0

Added

• Functional options pattern for Generate method (WithUF for VoterRegistration).
• Validation for identical-digit documents (e.g., 111.111.111-11 for CPF, 11.111.111/1111-11 for CNPJ).
• internal/digit package with pre-compiled regex and strings.Builder optimizations.
• Benchmarks for all document types (validation, formatting, generation).
• Document interface with Option type alias for cross-package compatibility.
• Exported document variables (brazilcode.CPF, brazilcode.CNPJ, etc.) for direct use.
• ErrDocTypeNotSupported exported error for better error handling.
• Sub-package usage: each document type can be imported individually.
• Migration guide in README.

Changed

• BREAKING: Module path changed from v2 to v3.
• BREAKING: Generate signature changed from Generate(params map[string]string) to Generate(opts ...Option).
• BREAKING: Removed src/ directory — packages moved to root-level sub-packages (cpf/, cnpj/, cnh/, renavam/, voter/).
• BREAKING: Removed iface package — Document interface now lives in root brazilcode package.
• BREAKING: voterRegistration package renamed to voter.
• Replaced regexp.MustCompile per-call with pre-compiled package-level regex.
• Replaced string concatenation (+=) with strings.Builder for document generation.
• Replaced fmt.Sprintf("%d", ...) with strconv.Itoa(...) for digit conversion.
• Replaced rand.Seed (deprecated) — uses global math/rand source.
• Consolidated utility functions into internal/digit (unexported to consumers).
• CNH Generate now retries on rare edge cases where check digits exceed single digit.

Removed

• src/ directory (Go anti-pattern).
• iface package (unnecessary indirection).
• utils package (consolidated into internal/digit).
• Debug fmt.Println in voter registration generation.