Headless agent sessions; audio simulation over media pipeline

What's Changed

• Update SDK to support new SIP options. by @dennwc in https://github.com/livekit/livekit-cli/pull/838
• Cache download-files in Dockerfile templates by using standalone commands by @aryeila in https://github.com/livekit/livekit-cli/pull/848
• agent_simulation: --audio runs simulations over the agent's media pipeline by @Bobronium in https://github.com/livekit/livekit-cli/pull/876
• fix(agent init): surface dependency install failures clearly + don't show install command if the cli installed deps by @u9g in https://github.com/livekit/livekit-cli/pull/884
• Default 'Install dependencies?' prompt to yes in agent create TUI by @u9g in https://github.com/livekit/livekit-cli/pull/885
• feat(cli): add lk agent session for headless text-mode agent runs by @toubatbrian in https://github.com/livekit/livekit-cli/pull/857
• simulate: Node agent support, --view mode, and TUI/start UX fixes by @u9g in https://github.com/livekit/livekit-cli/pull/878
• fix: regenerate fish_autocomplete for simulate --view flag by @u9g in https://github.com/livekit/livekit-cli/pull/889
• Pick up server-sdk-go v2.16.7 by @boks1971 in https://github.com/livekit/livekit-cli/pull/890

New Contributors

• @Bobronium made their first contribution in https://github.com/livekit/livekit-cli/pull/876

Full Changelog: https://github.com/livekit/livekit-cli/compare/v2.16.6...v2.16.7