fix(hooks): restore hooks.json in plugin dir, remove from settings.local

hooks.json in ~/.claude/skills/hub-guide/hooks/hooks.json IS auto-detected
by Claude Code for skills-dir plugins. Remove from settings.local.json
to avoid duplication.

- hooks.json restored with hooks wrapper + proper matchers
- install.sh simplified, no settings.json manipulation

hooks/hooks.json

@@ -0,0 +1,23 @@
+{
+  "hooks": {
+    "SessionStart": [{
+      "matcher": "startup|resume|compact",
+      "hooks": [{
+        "type": "command",
+        "command": "\"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/detect-project.sh\"",
+        "shell": "bash",
+        "timeout": 10,
+        "async": false
+      }]
+    }],
+    "PreToolUse": [{
+      "matcher": "Write|Edit",
+      "hooks": [{
+        "type": "command",
+        "command": "\"${CLAUDE_PLUGIN_ROOT}/hooks/scripts/detect-file-type.sh\"",
+        "shell": "bash",
+        "timeout": 10
+      }]
+    }]
+  }
+}