chore: model upgrades and CI hygiene (#1233)
- TTS: gemini-2.5-flash-preview-tts → gemini-2.5-pro-preview-tts
- moderation: claude-sonnet-4-20250514 → claude-sonnet-4-6
- CI: standardize astral-sh/setup-uv on v7, actions/checkout on v4
- CI: postgres 14 → 16 (matches Neon), rust 1.81 → 1.85 (matches moderation)
- remove stale TODO comment from status-maintenance workflow
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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