feat(examples/avatar): added animation triggers and trimmed personas

[brycedli]

Summary

• Add wave/dance/turn tools for Leila, Jess, and Mr Fox via LemonSlice pose triggers (actions.py)
• Auto-wave on session start and after switching to a motion-capable persona
• Trim persona list from 15 to 9; add Leila and Jess, remove underperforming personas; default to Leila
• Update playground dropdown and README

[CLAassistant]

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[devin-ai-integration]

Devin Review found 1 new potential issue.

View 6 additional findings in Devin Review.

[devin-ai-integration]

🟡 README claims motions are "for Leila only" but code enables them for Leila, Jess, and Mr Fox

The newly added README text states "Hero motions — for Leila only" but the code at examples/avatar/actions.py:17 defines ACTION_PERSONAS = frozenset({"leila", "jess", "mr_fox"}), and both Jess and Mr Fox personas have action-describing system prompts in examples/avatar/personas.py:80-83 and examples/avatar/personas.py:169-172. Users reading the README would not know that Jess and Mr Fox also support wave/dance/turn motions.

Suggested change

	- **Hero motions** — for **Leila** only, the LLM can trigger wave, dance,
	or turn via tool calls (one motion at a time, ~6 seconds each). She
	waves automatically when the session starts.
	- **Hero motions** — for **Leila**, **Jess**, and **Mr Fox**, the LLM can trigger wave, dance,
	or turn via tool calls (one motion at a time, ~6 seconds each). They
	wave automatically when the session starts.

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