Cara-4 as go-to model for python examples

[sebvanleuven]

Summary by cubic

Set cara-4 as the default avatar model across Python examples and docs, with clear guidance on model support. Hardened ANAM_AVATAR_MODEL parsing to strip whitespace/quotes and pass None when empty.

• Refactors

  • Updated README examples to avatar_model="cara-4" and added an "Avatar model" section.
  • Examples default to cara-4 via ANAM_AVATAR_MODEL; parsing strips whitespace/quotes and empty strings coerce to None.
  • Updated comments and PersonaConfig docstring to reference cara-4.

• Migration

  • If your avatar doesn’t support cara-4, use avatar_model="cara-3" or create a new avatar in lab.anam.ai.
  • You can override with ANAM_AVATAR_MODEL. Defaults to cara-4 in examples.

^{Written for commit e818172. Summary will update on new commits.}

[cubic-dev-ai]

2 issues found across 6 files

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Fix all with cubic | Re-trigger cubic</sub>