Conventional Commit Formatter

Format commit messages following the Conventional Commits spec (feat/fix/chore/docs/refactor/...) with optional scope and breaking-change marker.

Conventional Commits reference

• feat — new feature
• fix — bug fix
• docs — documentation only
• style — formatting, whitespace (no code change)
• refactor — neither feat nor fix
• perf — performance improvement
• test — adding or fixing tests
• build — build system or external deps
• ci — CI config files
• chore — misc maintenance
• revert — revert a commit