Migrate agent-bricks tools to official Databricks SDK when public API is available

[jacksandom]

Summary

The manage_ka, manage_mas MCP tools currently use private REST endpoints (/api/2.0/knowledge-assistants, /api/2.0/multi-agent-supervisors, /api/2.0/data-rooms) via raw requests calls in agent_bricks/manager.py. These can break without notice.

Changes needed

• KA / MAS: Replace all raw requests calls with WorkspaceClient SDK methods
  when w.knowledge_assistants / w.multi_agent_supervisors are publicly available
• Genie: w.genie SDK already exists for listing/querying — migrate remaining
  create/update/delete/curation operations from private /api/2.0/data-rooms/ to SDK
• Remove the TileExampleQueue background polling thread in favour of SDK wait patterns
• Remove manual _get / _post / _patch / _delete HTTP wrappers
• Update pyproject.toml SDK minimum version