fix(mem0-plugin): review fixes — loop guard, v3 response format, robustness

- on_stop_cursor.sh: add loop_count guard to prevent infinite re-entry
- on_stop.sh: drop set -e so stats failure doesn't kill the reminder
- _identity.py: fix fallback stub signatures to match production (accept cwd arg)
- on_pre_compact.py: add missing infer=False on session_state writes
- on_session_start.sh: handle v3 search response format (dict with results key)
- Align all plugin versions to 0.2.1 (Claude Code, Codex, Cursor)

mem0-plugin/scripts/on_session_start.sh

@@ -53,12 +53,15 @@ req = urllib.request.Request(
 )
 try:
     with urllib.request.urlopen(req, timeout=5) as r:
-        results = json.loads(r.read())
-        if isinstance(results, list):
-            n = len(results)
-            print(f'{n}+' if n >= 100 else str(n))
+        data = json.loads(r.read())
+        if isinstance(data, list):
+            results = data
+        elif isinstance(data, dict) and 'results' in data:
+            results = data['results']
         else:
-            print('?')
+            print('?'); raise SystemExit
+        n = len(results)
+        print(f'{n}+' if n >= 100 else str(n))
 except Exception:
     print('?')
 " 2>/dev/null || echo "?")