chore(repo): clean root and move docs

- Move docs to docs/; keep areas for prompts only
- Relocate Makefile to scripts/Makefile; update docs to use it
- Move ci.Dockerfile to docker/ci.Dockerfile; update compose
- Move commitlint config to .config and update hook
- Remove root AGENTS.md (use area AGENTS.md)

.config/commitlint.config.cjs

@@ -0,0 +1,4 @@
+export default {
+  extends: ['@commitlint/config-conventional'],
+};
+