Add 2 new skills + dedup fix

New skills:
- langgraph-workflow-creation (from LangGraphProjects)
- agent-supervisor (from multi_agent_workflow_demo_in_langgraph)

Fixes:
- Publisher dedup: skip existing skills
- Older repos: pushed_after 2024-06-01 (was 2026-05-01)
- Lower stars: 10 (was 15)

skills/langgraph-workflow-creation/examples.md

@@ -0,0 +1,10 @@
+# Examples: langgraph-workflow-creation
+
+## Usage Example
+
+```python
+# How to use this skill
+# Inputs: API Key for SerperDevTool, Search Query
+# Process: Step 1: Import necessary modules from langgraph and langchain libraries → Step 2: Create a LangGraph agent using `langgraph.create_react_agent` function with SerperDevTool as the tool node → Step 3: Define the search query and pass it to the agent for fact gathering
+# Outputs: Processed Facts
+```