chore(repo): clean root; move docs; keep areas for prompts

docs/README.md

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+Repository Docs
+
+Purpose
+- Centralize human‑readable documentation. Area folders (COMMON/CTO/COO/CCO) are reserved for questions, proposals, and prompt modules.
+
+Key Documents
+- Git workflow: [git-workflow.md](git-workflow.md)
+- Local CI parity: [bootstrap-cicd.md](bootstrap-cicd.md)
+- Documentation style: [docs-style.md](docs-style.md)
+- Operational notes: [RESUME.md](RESUME.md), [TODO.md](TODO.md)
+- History: [history/BOOTSTRAP.md](history/BOOTSTRAP.md)
+
+Usage
+- Make targets moved to `scripts/Makefile`. Use `make -f scripts/Makefile <target>`.
+