feat: add stale-case-reminder and weekly-feedback-analysis jobs

Declare two new cron jobs in plugin.json and manifest.ts, and implement
their handlers in worker.ts. stale-case-reminder runs daily at 08:00 and
posts a warning comment on any Paperclip issue linked to a legal-ai case
that has not been updated in 3+ days. weekly-feedback-analysis runs every
Sunday at 19:00, fetches the weekly chair-feedback summary from legal-ai,
and invokes the CEO agent to update decision-lessons.md with new lessons.

plugin.json

@@ -63,6 +63,18 @@
       "displayName": "סנכרון סטטוס תיקים",
       "description": "סנכרון סטטוס בין legal-ai ל-Paperclip כל 15 דקות",
       "schedule": "*/15 * * * *"
+    },
+    {
+      "jobKey": "stale-case-reminder",
+      "displayName": "תזכורת תיקים תקועים",
+      "description": "מזהה תיקים שלא עודכנו 3+ ימים ומוסיף תגובה ל-issue",
+      "schedule": "0 8 * * *"
+    },
+    {
+      "jobKey": "weekly-feedback-analysis",
+      "displayName": "ניתוח פידבק שבועי",
+      "description": "מסכם פידבק יו\"ר מהשבוע האחרון ומעדכן את decision-lessons.md",
+      "schedule": "0 19 * * 0"
     }
   ],
   "webhooks": [