Conventional commit parsing, validation, and formatting.

Implements the Conventional Commits specification as a pure library — no I/O, no git operations, no terminal output.

Main entry points

• [parse] — parse a commit message into a [ConventionalCommit]
• [lint] — validate a message against a [LintConfig]
• [format] — render a [ConventionalCommit] back to a well-formed string

Example

use standard_commit::{parse, format, lint, LintConfig};

let commit = parse("feat(auth): add OAuth2 PKCE flow").unwrap();
assert_eq!(commit.r#type, "feat");
assert_eq!(commit.scope.as_deref(), Some("auth"));

// Round-trip: format back to string
assert_eq!(format(&commit), "feat(auth): add OAuth2 PKCE flow");

// Lint with default rules
let errors = lint("feat: add login", &LintConfig::default());
assert!(errors.is_empty());