docs: update public voice reference ID

[leng-yue]

Summary

• replace the old public voice reference ID with 9a9cf47702da476aa4629e2506d4a857
• update all documentation examples, SDK references, configuration, and test harness constants

Why

The previous public voice reference ID is no longer the intended voice used by the documentation examples.

Impact

Users copying examples and tests running against the public voice will consistently use the new reference ID.

Validation

• confirmed the old ID has zero remaining occurrences
• confirmed the new ID appears in all 16 expected locations across 11 files
• git diff --check

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🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/update-public-voice-reference-id

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