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Fix Vector Search MCP tool names; add end-to-end RAG walkthrough (dat…

…abricks-solutions#213)

Addresses databricks-solutions#106.

Fix incorrect MCP tool names in SKILL.md:
- Replace non-existent consolidated tools (create_or_update_vs_endpoint,
  manage_vs_data) with actual individual tools (create_vs_endpoint,
  list_vs_endpoints, sync_vs_index, upsert_vs_data, etc.)
- This was a real bug — agents would fail trying to call tools that
  don't exist

Add end-to-end-rag.md:
- Complete walkthrough: source table -> endpoint -> index -> query -> agent
- Covers columns_to_sync guidance, filter syntax differences
  (Standard vs Storage-Optimized), hybrid search
- Shows VectorSearchRetrieverTool integration for ChatAgent

All MCP tool names verified against live workspace.

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