fix: start-workflow wakeup failure now returns 502 instead of silent success

If pc_wake_ceo fails, the endpoint now raises HTTP 502 and skips the
case_update to processing — preventing cases from silently getting stuck
with no CEO running. Also adds `processing` to CEO routing table and
updates case_list docstring with full status list.

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

mcp-server/src/legal_mcp/tools/cases.py

@@ -237,7 +237,10 @@ async def case_list(status: str = "", limit: int = 50) -> str:
     """רשימת תיקי ערר עם אפשרות סינון לפי סטטוס.
 
     Args:
-        status: סינון לפי סטטוס (new, in_progress, drafted, reviewed, final). ריק = הכל
+        status: סינון לפי סטטוס (new, processing, proofread, documents_ready, analyst_verified,
+        research_complete, outcome_set, direction_pending, direction_approved,
+        analysis_enriched, ready_for_writing, drafted, qa_passed, qa_failed,
+        exported, done). ריק = הכל
         limit: מספר תוצאות מקסימלי
     """
     cases = await db.list_cases(status=status or None, limit=limit)