fix: use record format for self-improving-agent hooks.json

Claude Code expects hooks as a record keyed by event name, not an array.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

engineering-team/self-improving-agent/hooks/hooks.json

@@ -1,11 +1,15 @@
 {
-  "hooks": [
-    {
-      "name": "error-capture",
-      "event": "PostToolUse",
-      "matcher": "Bash",
-      "command": "./hooks/error-capture.sh",
-      "description": "Detects command failures and appends structured entries to auto-memory. Zero overhead on successful commands."
-    }
-  ]
+  "hooks": {
+    "PostToolUse": [
+      {
+        "matcher": "Bash",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "./hooks/error-capture.sh"
+          }
+        ]
+      }
+    ]
+  }
 }