fix(appraiser-facts): valid Paperclip priority enum (normal→medium)

The 'חלץ עובדות שמאיות עכשיו' button returned HTTP 500. Root cause:
wake_analyst_for_appraiser_facts POSTs a child issue to Paperclip with
priority='normal', but Paperclip's ISSUE_PRIORITIES enum is only
critical|high|medium|low. createChildIssueSchema (Zod) rejects 'normal'
with 400 Bad Request; pc_request raise_for_status() turns it into a 500
surfaced to the chair. Fixed to 'medium' (the sole non-normal occurrence
in the repo).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web/paperclip_client.py

@@ -1083,7 +1083,10 @@ async def wake_analyst_for_appraiser_facts(
             "title": f"[ערר {case_number}] חילוץ עובדות שמאיות",
             "description": description,
             "status": "in_progress",
-            "priority": "normal",
+            # Paperclip ISSUE_PRIORITIES = critical|high|medium|low — "normal"
+            # is NOT a valid enum value and the createChildIssueSchema (Zod)
+            # rejects it with 400, which surfaces to the chair as a 500.
+            "priority": "medium",
             "assigneeAgentId": analyst_id,
         },
         raise_on_error=True,