Deepgram TTS errors surface; realtime generation cancels on speech interrupt

What's Changed

• fix: surface Deepgram TTS websocket errors by @nightcityblade in https://github.com/livekit/agents/pull/5728
• fix(voice): cancel realtime generation when speech is interrupted by @longcw in https://github.com/livekit/agents/pull/5703
• improve should_discard check by @chenghao-mou in https://github.com/livekit/agents/pull/5676
• (examples revamp): add example walkthroughs by @tinalenguyen in https://github.com/livekit/agents/pull/5613
• chore(deps): update dependency langchain-core to v1.3.3 [security] by @renovate[bot] in https://github.com/livekit/agents/pull/5693
• (inference stt): add speechmatics by @tinalenguyen in https://github.com/livekit/agents/pull/5740
• fix(ipc): run shutdown callbacks when entrypoint raises by @longcw in https://github.com/livekit/agents/pull/5741
• fix(dep): pin bithuman by @chenghao-mou in https://github.com/livekit/agents/pull/5743
• fix(barge-in): suppress session-level barge-in errors by @chenghao-mou in https://github.com/livekit/agents/pull/5727
• feat: support python -m livekit.agents.download for asset fetching by @davidzhao in https://github.com/livekit/agents/pull/5738
• feat(rime): add coda model support by @MaCaki in https://github.com/livekit/agents/pull/5748
• (speechmatics + inference): add VAD by @tinalenguyen in https://github.com/livekit/agents/pull/5750
• inference.LLM: add update_options for live model swaps by @theomonnom in https://github.com/livekit/agents/pull/5757
• fix(deepgram): add per-message recv timeout to TTS WebSocket by @longcw in https://github.com/livekit/agents/pull/5756
• livekit-agents@1.5.10 by @github-actions[bot] in https://github.com/livekit/agents/pull/5758

Full Changelog: https://github.com/livekit/agents/compare/livekit-agents@1.5.9...livekit-agents@1.5.10