fix(notion-writer): paginate clear_page_content to handle >100 blocks

notion.blocks.children.list returns at most 100 blocks per call.
Without pagination, --replace only cleared the first 100 blocks
of a page, leaving the rest behind and producing surprising
partial-replace behavior.

Loop with next_cursor until has_more is false so the entire
page is cleared.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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

@@ -671,19 +671,31 @@ def append_to_page(notion: Client, page_id: str, blocks: List[Dict]) -> bool:
 
 
 def clear_page_content(notion: Client, page_id: str) -> bool:
-    """Clear all content from a page."""
+    """Clear all content from a page (paginates through all children)."""
     try:
         formatted_id = format_id_with_dashes(page_id)
 
-        # Get all child blocks
+        # Notion's blocks.children.list returns at most 100 blocks per call.
-        children = notion.blocks.children.list(block_id=formatted_id)
+        # Paginate via next_cursor so --replace clears the entire page, not
+        # just the first 100 blocks.
+        cursor = None
+        while True:
+            kwargs = {'block_id': formatted_id, 'page_size': 100}
+            if cursor:
+                kwargs['start_cursor'] = cursor
+            children = notion.blocks.children.list(**kwargs)
 
-        # 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'])
 
+            if not children.get('has_more'):
+                break
+            cursor = children.get('next_cursor')
+            if not cursor:
+                break
+
         return True
     except Exception as e:
         print(f"Error clearing page: {e}")