Add commit and PR guidelines to AGENTS.md

Added guidelines for commit messages and PR titles.

Author: oesteban

AGENTS.md

@@ -86,3 +86,8 @@ Before accepting new PRs, we use the latest version of Ruff to lint the code, as
 - Always plan first
 - Think harder in the planning phase
 - When proposing tasks, highlight potential critical points that could lead to side effects.
+
+## Commits and PRs
+
+- Commit messages should follow the semantic commit conventions, and at least, contain one line with the following format: `<type-code>: <message>` where `<type-code>` indicates the type of comment. Type of comments can be fixes and bugfixes (`fix:`), enhancements and new features (`enh:`), style (`sty:`), documentation (`doc:`), maintenance (`mnt:`), etc.
+- PR titles should also be semantic, and use the same Type codes but in all caps (e.g., `FIX:`, `ENH:`, `STY:`, `DOC:`, `STY:`, `MNT:`)