fix: correct hooks.json structure with nested matcher objects

The hooks.json files had incorrect structure. Claude Code requires:
- Top-level "hooks" object
- Event names as keys containing arrays
- Each array element must have "matcher" and nested "hooks" array

Fixed 8 plugins:
- clarity-assist
- claude-config-maintainer
- cmdb-assistant
- contract-validator
- data-platform
- pr-review
- projman
- viz-platform

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

plugins/contract-validator/hooks/hooks.json

@@ -2,8 +2,13 @@
   "hooks": {
     "SessionStart": [
       {
-        "type": "command",
-        "command": "${CLAUDE_PLUGIN_ROOT}/hooks/auto-validate.sh"
+        "matcher": "",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "${CLAUDE_PLUGIN_ROOT}/hooks/auto-validate.sh"
+          }
+        ]
       }
     ],
     "PostToolUse": [