Add DnD vision example with 3 agents and 2 scenes

[Goguzgungor]

Summary

• Adds a new example notebook demonstrating TinyTroupe's vision capabilities through a DnD tabletop RPG scenario
• Three agent JSON files: a Dungeon Master (Greg), an experienced player (Talia), and a new player (Jordan)
• Two scenes: Scene 1 shows a world map to the DM who narrates and shares it with players; Scene 2 introduces a dungeon map, NPC allies, and an enemy
• Covers agent.see() with single/multiple images and the SHOW agent-to-agent action

New files

• examples/agents/Greg_DM.agent.json — DM persona
• examples/agents/Talia_Player.agent.json — experienced player persona
• examples/agents/Jordan_Player.agent.json — new player persona
• examples/DnD Adventure with Vision (image modality).ipynb — example notebook
• examples/images/dnd/ — 5 images (world map, dungeon map, knight NPC, cleric NPC, lizard enemy)

Test plan

• All 3 agent JSONs validated against existing schema
• Notebook runs end-to-end without errors (283s, 29 API calls)
• Agents behave as real DnD players (not AI assistants) thanks to broadcast_internal_goal
• SHOW action successfully shares images between agents
• Existing test_jupyter_examples.py will automatically pick up this notebook

[Goguzgungor]

@microsoft-github-policy-service agree