Commit message formatting

• build : changes to build system or dependencies
• chore: routine tasks, no production code changes
• ci : changes to CI configuration or scripts
• docs: documentation-only changes
• feat: new feature
• fix: bug fix
• perf: performance improvements
• refactor: code changes that neither fix a bug nor add a feature
• revert: revert a previous commit
• style: formatting, whitespace, semicolons, etc.
• test: adding or correcting tests