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)

docker/ci.compose.yml

@@ -2,7 +2,7 @@ services:
   ci:
     build:
       context: ..
-      dockerfile: ci.Dockerfile
+      dockerfile: docker/ci.Dockerfile
     working_dir: /workspace
     volumes:
       - "../:/workspace:Z"
@@ -10,4 +10,3 @@ services:
       - IN_CI_CONTAINER=1
     entrypoint: ["bash","-lc"]
     command: ["bash"]
-