docs: add AGENTS.md

AGENTS.md

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+# Agents
+
+## Commits
+
+Use [Conventional Commits](https://www.conventionalcommits.org/): `<type>(<scope>): <subject>`,
+with the scope optional. The types in use are `feat`, `fix`, `test`, `ci`, `chore`, `style`,
+`refactor` and `docs`. For example:
+
+- `fix(zone_sync): thaw zones when the sync is killed`
+- `ci: one workflow for tests, prek and the deploy to sega`