chore(repo): clean root (remove misplaced docs from main)

COMMON/README.md

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-COMMON
-
-Purpose
-- Foundational, shared practices usable across projects.
-- Opinionated but adaptable; intended as a base layer.
-
-Contents (initial)
-- Git workflow: [COMMON/git-workflow.md](git-workflow.md)
-- CI/bootstrap parity: [COMMON/bootstrap-cicd.md](bootstrap-cicd.md)
-- Documentation style: [COMMON/docs-style.md](docs-style.md)
-
-Notes
-- Keep content generic and reusable; project-specific overrides should live in the target repo.

COMMON/bootstrap-cicd.md

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-Local CI Parity & Bootstrap
-
-Purpose
-- Provide a portable CI toolchain via a Dockerized image and compose file so that format/lint/build checks run identically locally and in CI.
-
-Components
-- `ci.Dockerfile` – builds the CI image with shellcheck, shfmt, hadolint, actionlint, yamllint, Node tools.
-- `docker/ci.compose.yml` – runs the CI container mounting the repo at `/workspace`.
-- `scripts/ci` – wrapper for phases: `format`, `lint`, `build`, `test`, `security`, `all`.
-- Git hooks – `.githooks/*` installed via `scripts/setup-hooks`.
-
-Usage
-- Install hooks: `make hooks-setup`
-- Quick checks: `make quick` (format + lint)
-- Full pass: `make check` (all phases)
-
-Notes
-- Pre-commit hook runs format/lint and commit message checks.
-- Pre-push hook runs build/test/security placeholders.
-- CI workflow runs on integration and protected branches when runners are enabled.
-

COMMON/docs-style.md

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-Documentation Style Guide
-
-- When referencing another Markdown file in this repo, use a relative link so it is clickable in Gitea. Example: [COMMON/git-workflow.md](COMMON/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.
-