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.

settings.json

@@ -271,16 +271,6 @@
             "command": "bash ~/.claude/hooks/rtk-rewrite.sh"
           }
         ]
-      },
-      {
-        "matcher": "Edit|Write|MultiEdit",
-        "hooks": [
-          {
-            "type": "command",
-            "command": "bash ~/.claude/hooks/config-protection.sh",
-            "timeout": 5
-          }
-        ]
       }
     ],
     "UserPromptSubmit": [