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)

docs/docs-style.md

@@ -0,0 +1,8 @@
+Documentation Style Guide
+
+- When referencing another Markdown file in this repo, use a relative link so it is clickable in Gitea. Example: [docs/git-workflow.md](git-workflow.md).
+- Keep titles concise and descriptive; use sentence case unless a proper noun.
+- Prefer short bullets (one point per line). Merge related points.
+- Use backticks for commands, file paths, env vars, and code identifiers.
+- Make documents actionable: lead with outcomes, then steps, then background.
+