Add support for commitlint

[gfargo]

Would be awesome if coco could incorporate any rules or validation enforced by commitlint

// commitlint.config.js
module.exports = {
  extends: ['@commitlint/config-conventional'], // => @commitlint/config-conventional
};

If the message fails commitlint the resulting errors should be passed back into the prompt for consideration when regenerating.

e.g

# Lint from stdin
echo 'foo: bar' | commitlint
⧗   input: foo: bar
✖   type must be one of [build, chore, ci, docs, feat, fix, perf, refactor, revert, style, test] [type-enum]

✖   found 1 problems, 0 warnings
ⓘ   Get help: https://github.com/conventional-changelog/commitlint/#what-is-commitlint

[gfargo]

Definitely feels like a place where we should be using agent tools

• https://js.langchain.com/docs/how_to/tool_calling
• https://js.langchain.com/docs/how_to/#tools