Docs: Make end_sequence requirement clear

[sebvanleuven]

end_sequence is required after sending a tts response.
Make it clearer in the example by moving the end_sequence in the interactive loop.

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Summary by cubic

Clarifies that end_sequence must be sent after TTS so the avatar returns to listening mode. Requires ANAM_LLM_ID in the persona example to prevent missing config errors.

• Refactors

  • Move end_sequence() from utils into the interactive loops, called after TTS audio completes.
  • Add ANAM_LLM_ID to the required environment variable check in persona_interactive_video.py.
  • Add inline comments and small CLI/help text formatting tweaks.

• Dependencies

  • Upgrade anam to 0.2.0.

^{Written for commit 2252883. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 4 files

[robbie-anam]

Approve but with one question about llm id required.