chore(hooks): remove config-protection edit-block guardrail

Full removal per user request: the PreToolUse hook that blocked model
Edit/Write on quality-gate files (settings.json, gitflow.sh, .githooks,
doctor.sh, hooks, lib/tests, lint configs) plus its one-shot sentinel.

- delete hooks/config-protection.sh
- delete lib/tests/config-protection.test.sh
- deregister the hook from settings.json (rtk-rewrite PreToolUse kept)
- drop the README mention

Residual protection unchanged: gitflow pre-commit guard + Gitea branch
protection still block direct code commits to main/develop.

README.md

@@ -23,7 +23,7 @@ claude-config/
 ├── update-all.sh          # One-command update for all components
 ├── Makefile               # Unified entry point: make install / doctor / update
 ├── plugins.lock.json      # Version pinning for non-marketplace dependencies
-├── hooks/                 # Session start, statusline, RTK rewrite, config-protection + design-toolchain guards
+├── hooks/                 # Session start, statusline, RTK rewrite + design-toolchain guards
 ├── agents/                # Execution units called by skills (never invoked directly)
 ├── skills/                # Entry points invoked via /skill-name
 ├── skills-external/       # Vendored skill packs (gstack submodule + installer-fetched design packs)