fix(notion-writer): skip archived blocks when replacing page content

The --replace flag failed with "Can't edit block that is archived" when
a page contained previously archived blocks. Now skips them during clear.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

custom-skills/32-notion-writer/code/scripts/notion_writer.py

@@ -349,8 +349,10 @@ def clear_page_content(notion: Client, page_id: str) -> bool:
         # Get all child blocks
         children = notion.blocks.children.list(block_id=formatted_id)
 
-        # Delete each block
+        # Delete each block (skip already archived blocks)
         for block in children.get('results', []):
+            if block.get('archived'):
+                continue
             notion.blocks.delete(block_id=block['id'])
 
         return True